639086689984 has 56 divisors (see below), whose sum is σ = 1277014464000. Its totient is φ = 317320335360.

The previous prime is 639086689973. The next prime is 639086690027. The reversal of 639086689984 is 489986680936.

It is a super-3 number, since 3×639086689984³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639086689984.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67119144 + ... + 67128664.

Almost surely, 2^639086689984 is an apocalyptic number.

639086689984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

639086689984 is a deficient number, since it is larger than the sum of its proper divisors (637927774016).

639086689984 is a wasteful number, since it uses less digits than its factorization.

639086689984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16721 (or 16711 counting only the distinct ones).

The product of its (nonzero) digits is 967458816, while the sum is 76.

The spelling of 639086689984 in words is "six hundred thirty-nine billion, eighty-six million, six hundred eighty-nine thousand, nine hundred eighty-four".