626642864 has 20 divisors (see below), whose sum is σ = 1214531640. Its totient is φ = 313215360.

The previous prime is 626642851. The next prime is 626642873. The reversal of 626642864 is 468246626.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66647 + ... + 75465.

It is an arithmetic number, because the mean of its divisors is an integer number (60726582).

Almost surely, 2^626642864 is an apocalyptic number.

It is an amenable number.

626642864 is a deficient number, since it is larger than the sum of its proper divisors (587888776).

626642864 is a wasteful number, since it uses less digits than its factorization.

626642864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13268 (or 13262 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The square root of 626642864 is about 25032.8357163147. The cubic root of 626642864 is about 855.7364533534.

The spelling of 626642864 in words is "six hundred twenty-six million, six hundred forty-two thousand, eight hundred sixty-four".