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69899920 = 24517103499
BaseRepresentation
bin1000010101010…
…01011010010000
311212112021122221
410022221122100
5120343244140
610534110424
71506065566
oct412513220
9155467587
1069899920
1136502932
121b4ab414
13116350cc
1493d7a36
15620b14a
hex42a9690

69899920 has 80 divisors (see below), whose sum is σ = 174096000. Its totient is φ = 26007552.

The previous prime is 69899899. The next prime is 69899927. The reversal of 69899920 is 2999896.

69899920 = T210 + T211 + ... + T753.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69899927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139831 + ... + 140329.

It is an arithmetic number, because the mean of its divisors is an integer number (2176200).

Almost surely, 269899920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69899920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87048000).

69899920 is an abundant number, since it is smaller than the sum of its proper divisors (104196080).

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

69899920 is a wasteful number, since it uses less digits than its factorization.

69899920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 69899920 is about 8360.6172020970. The cubic root of 69899920 is about 411.9320276214.

The spelling of 69899920 in words is "sixty-nine million, eight hundred ninety-nine thousand, nine hundred twenty".

Divisors: 1 2 4 5 8 10 16 17 20 34 40 68 80 85 103 136 170 206 272 340 412 499 515 680 824 998 1030 1360 1648 1751 1996 2060 2495 3502 3992 4120 4990 7004 7984 8240 8483 8755 9980 14008 16966 17510 19960 28016 33932 35020 39920 42415 51397 67864 70040 84830 102794 135728 140080 169660 205588 256985 339320 411176 513970 678640 822352 873749 1027940 1747498 2055880 3494996 4111760 4368745 6989992 8737490 13979984 17474980 34949960 69899920