Search a number
-
+
87887280 = 243513171657
BaseRepresentation
bin1010011110100…
…00110110110000
320010101010200110
411033100312300
5134444343110
612415421320
72115013065
oct517206660
9203333613
1087887280
1145679018
1225524840
1315292410
14b95ac6c
157ab0a20
hex53d0db0

87887280 has 160 divisors (see below), whose sum is σ = 310855104. Its totient is φ = 20348928.

The previous prime is 87887273. The next prime is 87887291. The reversal of 87887280 is 8278878.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52212 + ... + 53868.

Almost surely, 287887280 is an apocalyptic number.

87887280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87887280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155427552).

87887280 is an abundant number, since it is smaller than the sum of its proper divisors (222967824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87887280 is a wasteful number, since it uses less digits than its factorization.

87887280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The square root of 87887280 is about 9374.8215983026. The cubic root of 87887280 is about 444.6060225473.

The spelling of 87887280 in words is "eighty-seven million, eight hundred eighty-seven thousand, two hundred eighty".

Divisors: 1 2 3 4 5 6 8 10 12 13 15 16 17 20 24 26 30 34 39 40 48 51 52 60 65 68 78 80 85 102 104 120 130 136 156 170 195 204 208 221 240 255 260 272 312 340 390 408 442 510 520 624 663 680 780 816 884 1020 1040 1105 1326 1360 1560 1657 1768 2040 2210 2652 3120 3314 3315 3536 4080 4420 4971 5304 6628 6630 8285 8840 9942 10608 13256 13260 16570 17680 19884 21541 24855 26512 26520 28169 33140 39768 43082 49710 53040 56338 64623 66280 79536 84507 86164 99420 107705 112676 129246 132560 140845 169014 172328 198840 215410 225352 258492 281690 323115 338028 344656 366197 397680 422535 430820 450704 516984 563380 646230 676056 732394 845070 861640 1033968 1098591 1126760 1292460 1352112 1464788 1690140 1723280 1830985 2197182 2253520 2584920 2929576 3380280 3661970 4394364 5169840 5492955 5859152 6760560 7323940 8788728 10985910 14647880 17577456 21971820 29295760 43943640 87887280