643512264 has 64 divisors (see below), whose sum is σ = 1627299840. Its totient is φ = 212051520.

The previous prime is 643512253. The next prime is 643512281. The reversal of 643512264 is 462215346.

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, 1059849 + ... + 1060455.

It is an arithmetic number, because the mean of its divisors is an integer number (25426560).

Almost surely, 2^643512264 is an apocalyptic number.

It is an amenable number.

643512264 is an abundant number, since it is smaller than the sum of its proper divisors (983787576).

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

643512264 is a wasteful number, since it uses less digits than its factorization.

643512264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1046 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 643512264 is about 25367.5435152874. The cubic root of 643512264 is about 863.3474475148.

The spelling of 643512264 in words is "six hundred forty-three million, five hundred twelve thousand, two hundred sixty-four".