77921012124 has 60 divisors (see below), whose sum is σ = 206570005488. Its totient is φ = 25607836800.

The previous prime is 77921012111. The next prime is 77921012171. The reversal of 77921012124 is 42121012977.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1670637 + ... + 1716644.

Almost surely, 2^77921012124 is an apocalyptic number.

It is an amenable number.

77921012124 is an abundant number, since it is smaller than the sum of its proper divisors (128648993364).

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

77921012124 is a wasteful number, since it uses less digits than its factorization.

77921012124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387368 (or 3387357 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 77921012124 in words is "seventy-seven billion, nine hundred twenty-one million, twelve thousand, one hundred twenty-four".