642844372 has 6 divisors (see below), whose sum is σ = 1124977658. Its totient is φ = 321422184.

The previous prime is 642844369. The next prime is 642844387. The reversal of 642844372 is 273448246.

It can be written as a sum of positive squares in only one way, i.e., 379236676 + 263607696 = 19474^2 + 16236^2 .

It is a super-2 number, since 2×642844372² = 826497773224148768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80355543 + ... + 80355550.

Almost surely, 2^642844372 is an apocalyptic number.

It is an amenable number.

642844372 is a deficient number, since it is larger than the sum of its proper divisors (482133286).

642844372 is a wasteful number, since it uses less digits than its factorization.

642844372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160711097 (or 160711095 counting only the distinct ones).

The product of its digits is 258048, while the sum is 40.

The square root of 642844372 is about 25354.3757959055. The cubic root of 642844372 is about 863.0486588772.

The spelling of 642844372 in words is "six hundred forty-two million, eight hundred forty-four thousand, three hundred seventy-two".