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64971564 = 22371940709
BaseRepresentation
bin1111011111011…
…0001100101100
311112020220020020
43313312030230
5113113042224
610240322140
71416151320
oct367661454
9145226206
1064971564
1133747109
1219913350
13105cab18
1488b3980
155a85c79
hex3df632c

64971564 has 48 divisors (see below), whose sum is σ = 182380800. Its totient is φ = 17585856.

The previous prime is 64971563. The next prime is 64971589. The reversal of 64971564 is 46517946.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (64971563) 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, 18759 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (3799600).

Almost surely, 264971564 is an apocalyptic number.

It is an amenable number.

64971564 is an abundant number, since it is smaller than the sum of its proper divisors (117409236).

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

64971564 is a wasteful number, since it uses less digits than its factorization.

64971564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40742 (or 40740 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 64971564 is about 8060.4940295245. The cubic root of 64971564 is about 402.0139348156.

The spelling of 64971564 in words is "sixty-four million, nine hundred seventy-one thousand, five hundred sixty-four".

Divisors: 1 2 3 4 6 7 12 14 19 21 28 38 42 57 76 84 114 133 228 266 399 532 798 1596 40709 81418 122127 162836 244254 284963 488508 569926 773471 854889 1139852 1546942 1709778 2320413 3093884 3419556 4640826 5414297 9281652 10828594 16242891 21657188 32485782 64971564