639808080 has 40 divisors (see below), whose sum is σ = 1983405792. Its totient is φ = 170615424.

The previous prime is 639808079. The next prime is 639808151. The reversal of 639808080 is 80808936.

639808080 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332694 + ... + 1333173.

Almost surely, 2^639808080 is an apocalyptic number.

639808080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

639808080 is an abundant number, since it is smaller than the sum of its proper divisors (1343597712).

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

639808080 is a wasteful number, since it uses less digits than its factorization.

639808080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665883 (or 2665877 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 639808080 is about 25294.4278448831. The cubic root of 639808080 is about 861.6877259204.

The spelling of 639808080 in words is "six hundred thirty-nine million, eight hundred eight thousand, eighty".