64255920 has 80 divisors (see below), whose sum is σ = 210924000. Its totient is φ = 16125952.

The previous prime is 64255913. The next prime is 64255921. The reversal of 64255920 is 2955246.

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

It is not an unprimeable number, because it can be changed into a prime (64255921) 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, 3795 + ... + 11954.

It is an arithmetic number, because the mean of its divisors is an integer number (2636550).

Almost surely, 2^64255920 is an apocalyptic number.

64255920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64255920 is an abundant number, since it is smaller than the sum of its proper divisors (146668080).

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

64255920 is a wasteful number, since it uses less digits than its factorization.

64255920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15782 (or 15776 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 64255920 is about 8015.9790418888. The cubic root of 64255920 is about 400.5324575745.

The spelling of 64255920 in words is "sixty-four million, two hundred fifty-five thousand, nine hundred twenty".