639626700 has 144 divisors (see below), whose sum is σ = 1973873664. Its totient is φ = 159360000.

The previous prime is 639626681. The next prime is 639626747. The reversal of 639626700 is 7626936.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 851325 + ... + 852075.

It is an arithmetic number, because the mean of its divisors is an integer number (13707456).

Almost surely, 2^639626700 is an apocalyptic number.

639626700 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 639626700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986936832).

639626700 is an abundant number, since it is smaller than the sum of its proper divisors (1334246964).

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

639626700 is a wasteful number, since it uses less digits than its factorization.

639626700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 945 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 639626700 is about 25290.8422161066. The cubic root of 639626700 is about 861.6062912443.

The spelling of 639626700 in words is "six hundred thirty-nine million, six hundred twenty-six thousand, seven hundred".