64875920 has 20 divisors (see below), whose sum is σ = 150836700. Its totient is φ = 25950336.

The previous prime is 64875809. The next prime is 64875931. The reversal of 64875920 is 2957846.

It can be written as a sum of positive squares in 2 ways, for example, as 7661824 + 57214096 = 2768^2 + 7564^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405395 + ... + 405554.

It is an arithmetic number, because the mean of its divisors is an integer number (7541835).

Almost surely, 2^64875920 is an apocalyptic number.

It is an amenable number.

64875920 is an abundant number, since it is smaller than the sum of its proper divisors (85960780).

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

64875920 is a wasteful number, since it uses less digits than its factorization.

64875920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810962 (or 810956 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 64875920 is about 8054.5589575097. The cubic root of 64875920 is about 401.8165710190.

The spelling of 64875920 in words is "sixty-four million, eight hundred seventy-five thousand, nine hundred twenty".