640615113 has 24 divisors (see below), whose sum is σ = 967267392. Its totient is φ = 407788128.

The previous prime is 640615061. The next prime is 640615181. The reversal of 640615113 is 311516046.

640615113 is a `hidden beast` number, since 6 + 40 + 615 + 1 + 1 + 3 = 666.

It is not a de Polignac number, because 640615113 - 2⁸ = 640614857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640615013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130695 + ... + 135507.

It is an arithmetic number, because the mean of its divisors is an integer number (40302808).

Almost surely, 2^640615113 is an apocalyptic number.

It is an amenable number.

640615113 is a deficient number, since it is larger than the sum of its proper divisors (326652279).

640615113 is a wasteful number, since it uses less digits than its factorization.

640615113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485 (or 5482 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 640615113 is about 25310.3755997417. The cubic root of 640615113 is about 862.0498752730.

The spelling of 640615113 in words is "six hundred forty million, six hundred fifteen thousand, one hundred thirteen".