76684639920 has 160 divisors (see below), whose sum is σ = 285981934080. Its totient is φ = 16605388800.

The previous prime is 76684639909. The next prime is 76684639943. The reversal of 76684639920 is 2993648667.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169281 + ... + 1233120.

It is an arithmetic number, because the mean of its divisors is an integer number (1787387088).

Almost surely, 2^76684639920 is an apocalyptic number.

76684639920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

76684639920 is an abundant number, since it is smaller than the sum of its proper divisors (209297294160).

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

76684639920 is a wasteful number, since it uses less digits than its factorization.

76684639920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402443 (or 2402437 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 76684639920 in words is "seventy-six billion, six hundred eighty-four million, six hundred thirty-nine thousand, nine hundred twenty".