639706100 has 36 divisors (see below), whose sum is σ = 1514361408. Its totient is φ = 232620000.

The previous prime is 639706097. The next prime is 639706103. The reversal of 639706100 is 1607936.

It is an interprime number because it is at equal distance from previous prime (639706097) and next prime (639706103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639706103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289676 + ... + 291875.

Almost surely, 2^639706100 is an apocalyptic number.

It is an amenable number.

639706100 is an abundant number, since it is smaller than the sum of its proper divisors (874655308).

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

639706100 is a wasteful number, since it uses less digits than its factorization.

639706100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581576 (or 581569 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 639706100 is about 25292.4119055499. The cubic root of 639706100 is about 861.6419415744.

The spelling of 639706100 in words is "six hundred thirty-nine million, seven hundred six thousand, one hundred".