64620520 has 32 divisors (see below), whose sum is σ = 153050400. Its totient is φ = 24487488.

The previous prime is 64620511. The next prime is 64620557. The reversal of 64620520 is 2502646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41754 + ... + 43273.

It is an arithmetic number, because the mean of its divisors is an integer number (4782825).

Almost surely, 2^64620520 is an apocalyptic number.

It is an amenable number.

64620520 is an abundant number, since it is smaller than the sum of its proper divisors (88429880).

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

64620520 is a wasteful number, since it uses less digits than its factorization.

64620520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85057 (or 85053 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64620520 is about 8038.6889478322. The cubic root of 64620520 is about 401.2885943538.

The spelling of 64620520 in words is "sixty-four million, six hundred twenty thousand, five hundred twenty".