64504872 has 24 divisors (see below), whose sum is σ = 174700890. Its totient is φ = 21501600.

The previous prime is 64504823. The next prime is 64504873. The reversal of 64504872 is 27840546.

64504872 is a `hidden beast` number, since 645 + 0 + 4 + 8 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 13439556 = 7146^2 + 3666^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (64504873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 447879 + ... + 448022.

Almost surely, 2^64504872 is an apocalyptic number.

It is an amenable number.

64504872 is an abundant number, since it is smaller than the sum of its proper divisors (110196018).

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

64504872 is a wasteful number, since it uses less digits than its factorization.

64504872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895913 (or 895906 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 64504872 is about 8031.4925138482. The cubic root of 64504872 is about 401.0490629288.

The spelling of 64504872 in words is "sixty-four million, five hundred four thousand, eight hundred seventy-two".