642338874 has 12 divisors (see below), whose sum is σ = 1391734266. Its totient is φ = 214112952.

The previous prime is 642338857. The next prime is 642338881. The reversal of 642338874 is 478833246.

It can be written as a sum of positive squares in only one way, i.e., 503688249 + 138650625 = 22443^2 + 11775^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17842729 + ... + 17842764.

Almost surely, 2^642338874 is an apocalyptic number.

642338874 is an abundant number, since it is smaller than the sum of its proper divisors (749395392).

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

642338874 is a wasteful number, since it uses less digits than its factorization.

642338874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35685501 (or 35685498 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 642338874 is about 25344.4051814202. The cubic root of 642338874 is about 862.8223813141.

The spelling of 642338874 in words is "six hundred forty-two million, three hundred thirty-eight thousand, eight hundred seventy-four".