645882636 has 48 divisors (see below), whose sum is σ = 1723721216. Its totient is φ = 184391424.

The previous prime is 645882583. The next prime is 645882647. The reversal of 645882636 is 636288546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147105 + ... + 151431.

Almost surely, 2^645882636 is an apocalyptic number.

It is an amenable number.

645882636 is an abundant number, since it is smaller than the sum of its proper divisors (1077838580).

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

645882636 is a wasteful number, since it uses less digits than its factorization.

645882636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118 (or 6116 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 645882636 is about 25414.2211369934. The cubic root of 645882636 is about 864.4061929655.

The spelling of 645882636 in words is "six hundred forty-five million, eight hundred eighty-two thousand, six hundred thirty-six".