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129218240 = 2651953401
BaseRepresentation
bin1111011001110…
…11011011000000
3100000010222002202
413230323123000
5231034440430
620453332332
73126223364
oct754733300
9300128082
10129218240
1166a38638
12373370a8
1320a039c8
14132392a4
15b526d45
hex7b3b6c0

129218240 has 112 divisors (see below), whose sum is σ = 330829920. Its totient is φ = 47923200.

The previous prime is 129218237. The next prime is 129218251. The reversal of 129218240 is 42812921.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322040 + ... + 322440.

Almost surely, 2129218240 is an apocalyptic number.

129218240 is a gapful number since it is divisible by the number (10) 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 129218240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165414960).

129218240 is an abundant number, since it is smaller than the sum of its proper divisors (201611680).

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

129218240 is a wasteful number, since it uses less digits than its factorization.

129218240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 129218240 is about 11367.4201118811. The cubic root of 129218240 is about 505.5622141019.

The spelling of 129218240 in words is "one hundred twenty-nine million, two hundred eighteen thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 16 19 20 32 38 40 53 64 76 80 95 106 152 160 190 212 265 304 320 380 401 424 530 608 760 802 848 1007 1060 1216 1520 1604 1696 2005 2014 2120 3040 3208 3392 4010 4028 4240 5035 6080 6416 7619 8020 8056 8480 10070 12832 15238 16040 16112 16960 20140 21253 25664 30476 32080 32224 38095 40280 42506 60952 64160 64448 76190 80560 85012 106265 121904 128320 152380 161120 170024 212530 243808 304760 322240 340048 403807 425060 487616 609520 680096 807614 850120 1219040 1360192 1615228 1700240 2019035 2438080 3230456 3400480 4038070 6460912 6800960 8076140 12921824 16152280 25843648 32304560 64609120 129218240