64625904 has 240 divisors, whose sum is σ = 223914240. Its totient is φ = 17781120.

The previous prime is 64625903. The next prime is 64625923. The reversal of 64625904 is 40952646.

64625904 is a `hidden beast` number, since 6 + 4 + 62 + 590 + 4 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64625903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 910189 + ... + 910259.

It is an arithmetic number, because the mean of its divisors is an integer number (932976).

Almost surely, 2^64625904 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 64625904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111957120).

64625904 is an abundant number, since it is smaller than the sum of its proper divisors (159288336).

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

64625904 is a wasteful number, since it uses less digits than its factorization.

64625904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 64625904 is about 8039.0238213355. The cubic root of 64625904 is about 401.2997387900.

The spelling of 64625904 in words is "sixty-four million, six hundred twenty-five thousand, nine hundred four".