64520457 has 16 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 40324352.

The previous prime is 64520441. The next prime is 64520459. The reversal of 64520457 is 75402546.

It is a cyclic number.

It is not a de Polignac number, because 64520457 - 2⁴ = 64520441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64520459) 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, 11368 + ... + 16070.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^64520457 is an apocalyptic number.

It is an amenable number.

64520457 is a deficient number, since it is larger than the sum of its proper divisors (26925303).

64520457 is a wasteful number, since it uses less digits than its factorization.

64520457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992.

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 64520457 is about 8032.4626983261. The cubic root of 64520457 is about 401.0813594368.

The spelling of 64520457 in words is "sixty-four million, five hundred twenty thousand, four hundred fifty-seven".