64521808 has 40 divisors (see below), whose sum is σ = 140491008. Its totient is φ = 28482432.

The previous prime is 64521761. The next prime is 64521833. The reversal of 64521808 is 80812546.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1960 + ... + 11527.

Almost surely, 2^64521808 is an apocalyptic number.

It is an amenable number.

64521808 is an abundant number, since it is smaller than the sum of its proper divisors (75969200).

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

64521808 is a wasteful number, since it uses less digits than its factorization.

64521808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13531 (or 13525 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 64521808 is about 8032.5467941370. The cubic root of 64521808 is about 401.0841588442.

The spelling of 64521808 in words is "sixty-four million, five hundred twenty-one thousand, eight hundred eight".