76820731666128 has 60 divisors (see below), whose sum is σ = 214992404437668. Its totient is φ = 25606785346560.

The previous prime is 76820731666099. The next prime is 76820731666187. The reversal of 76820731666128 is 82166613702867.

It can be written as a sum of positive squares in 2 ways, for example, as 24689847956544 + 52130883709584 = 4968888^2 + 7220172^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31019958 + ... + 33404778.

Almost surely, 2^{76820731666128} is an apocalyptic number.

It is an amenable number.

76820731666128 is an abundant number, since it is smaller than the sum of its proper divisors (138171672771540).

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

76820731666128 is a wasteful number, since it uses less digits than its factorization.

76820731666128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608532 (or 2608523 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 76820731666128 in words is "seventy-six trillion, eight hundred twenty billion, seven hundred thirty-one million, six hundred sixty-six thousand, one hundred twenty-eight".