643104264 has 64 divisors (see below), whose sum is σ = 1765800000. Its totient is φ = 193560320.

The previous prime is 643104239. The next prime is 643104281. The reversal of 643104264 is 462401346.

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, 31162 + ... + 47510.

It is an arithmetic number, because the mean of its divisors is an integer number (27590625).

Almost surely, 2^643104264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643104264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882900000).

643104264 is an abundant number, since it is smaller than the sum of its proper divisors (1122695736).

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

643104264 is a wasteful number, since it uses less digits than its factorization.

643104264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16518 (or 16514 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 643104264 is about 25359.5004682663. The cubic root of 643104264 is about 863.1649489321.

The spelling of 643104264 in words is "six hundred forty-three million, one hundred four thousand, two hundred sixty-four".