64520680 has 32 divisors (see below), whose sum is σ = 165911040. Its totient is φ = 22121280.

The previous prime is 64520671. The next prime is 64520693. The reversal of 64520680 is 8602546.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

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, 114936 + ... + 115495.

It is an arithmetic number, because the mean of its divisors is an integer number (5184720).

Almost surely, 2^64520680 is an apocalyptic number.

It is an amenable number.

64520680 is an abundant number, since it is smaller than the sum of its proper divisors (101390360).

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

64520680 is a wasteful number, since it uses less digits than its factorization.

64520680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230449 (or 230445 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 64520680 is about 8032.4765794866. The cubic root of 64520680 is about 401.0818215178.

The spelling of 64520680 in words is "sixty-four million, five hundred twenty thousand, six hundred eighty".