642154872 has 32 divisors (see below), whose sum is σ = 1699822800. Its totient is φ = 201460224.

The previous prime is 642154853. The next prime is 642154883. The reversal of 642154872 is 278451246.

It is a self number, because there is not a number n which added to its sum of digits gives 642154872.

It is a congruent number.

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, 786547 + ... + 787362.

Almost surely, 2^642154872 is an apocalyptic number.

It is an amenable number.

642154872 is an abundant number, since it is smaller than the sum of its proper divisors (1057667928).

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

642154872 is a wasteful number, since it uses less digits than its factorization.

642154872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573935 (or 1573931 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 642154872 is about 25340.7748894938. The cubic root of 642154872 is about 862.7399864848.

The spelling of 642154872 in words is "six hundred forty-two million, one hundred fifty-four thousand, eight hundred seventy-two".