643670592 has 56 divisors (see below), whose sum is σ = 1803233376. Its totient is φ = 201934848.

The previous prime is 643670557. The next prime is 643670623. The reversal of 643670592 is 295076346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95338 + ... + 101865.

It is an arithmetic number, because the mean of its divisors is an integer number (32200596).

Almost surely, 2^643670592 is an apocalyptic number.

It is an amenable number.

643670592 is an abundant number, since it is smaller than the sum of its proper divisors (1159562784).

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

643670592 is a wasteful number, since it uses less digits than its factorization.

643670592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197235 (or 197225 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 643670592 is about 25370.6640039239. The cubic root of 643670592 is about 863.4182469248.

It can be divided in two parts, 6436 and 70592, that added together give a triangular number (77028 = T₃₉₂).

The spelling of 643670592 in words is "six hundred forty-three million, six hundred seventy thousand, five hundred ninety-two".