642938200 has 24 divisors (see below), whose sum is σ = 1494831780. Its totient is φ = 257175200.

The previous prime is 642938189. The next prime is 642938201. The reversal of 642938200 is 2839246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642938201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1607146 + ... + 1607545.

Almost surely, 2^642938200 is an apocalyptic number.

It is an amenable number.

642938200 is an abundant number, since it is smaller than the sum of its proper divisors (851893580).

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

642938200 is a wasteful number, since it uses less digits than its factorization.

642938200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214707 (or 3214698 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 642938200 is about 25356.2260598852. The cubic root of 642938200 is about 863.0906463284.

The spelling of 642938200 in words is "six hundred forty-two million, nine hundred thirty-eight thousand, two hundred".