64536513 has 16 divisors (see below), whose sum is σ = 91891200. Its totient is φ = 40199040.

The previous prime is 64536509. The next prime is 64536523. The reversal of 64536513 is 31563546.

It is not a de Polignac number, because 64536513 - 2² = 64536509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64536503) 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, 9268 + ... + 14661.

It is an arithmetic number, because the mean of its divisors is an integer number (5743200).

Almost surely, 2^64536513 is an apocalyptic number.

It is an amenable number.

64536513 is a deficient number, since it is larger than the sum of its proper divisors (27354687).

64536513 is a wasteful number, since it uses less digits than its factorization.

64536513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23992.

The product of its digits is 32400, while the sum is 33.

The square root of 64536513 is about 8033.4620805727. The cubic root of 64536513 is about 401.1146265508.

The spelling of 64536513 in words is "sixty-four million, five hundred thirty-six thousand, five hundred thirteen".