642704100 has 72 divisors (see below), whose sum is σ = 1864359840. Its totient is φ = 170945280.

The previous prime is 642704093. The next prime is 642704137. The reversal of 642704100 is 1407246.

642704100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123144 + ... + 128256.

Almost surely, 2^642704100 is an apocalyptic number.

642704100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642704100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932179920).

642704100 is an abundant number, since it is smaller than the sum of its proper divisors (1221655740).

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

642704100 is a wasteful number, since it uses less digits than its factorization.

642704100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5549 (or 5542 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 642704100 is about 25351.6094163664. The cubic root of 642704100 is about 862.9858804022.

The spelling of 642704100 in words is "six hundred forty-two million, seven hundred four thousand, one hundred".