642994372 has 6 divisors (see below), whose sum is σ = 1125240158. Its totient is φ = 321497184.

The previous prime is 642994369. The next prime is 642994393. The reversal of 642994372 is 273499246.

It can be written as a sum of positive squares in only one way, i.e., 502477056 + 140517316 = 22416^2 + 11854^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80374293 + ... + 80374300.

Almost surely, 2^642994372 is an apocalyptic number.

It is an amenable number.

642994372 is a deficient number, since it is larger than the sum of its proper divisors (482245786).

642994372 is a wasteful number, since it uses less digits than its factorization.

642994372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160748597 (or 160748595 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 642994372 is about 25357.3336926421. Note that the first 3 decimals coincide. The cubic root of 642994372 is about 863.1157809971.

The spelling of 642994372 in words is "six hundred forty-two million, nine hundred ninety-four thousand, three hundred seventy-two".