77938173702 has 32 divisors (see below), whose sum is σ = 173255666400. Its totient is φ = 25970432544.

The previous prime is 77938173683. The next prime is 77938173707. The reversal of 77938173702 is 20737183977.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77938173707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89877 + ... + 404912.

It is an arithmetic number, because the mean of its divisors is an integer number (5414239575).

Almost surely, 2^77938173702 is an apocalyptic number.

77938173702 is an abundant number, since it is smaller than the sum of its proper divisors (95317492698).

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

77938173702 is a wasteful number, since it uses less digits than its factorization.

77938173702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497717 (or 497711 counting only the distinct ones).

The product of its (nonzero) digits is 3111696, while the sum is 54.

The spelling of 77938173702 in words is "seventy-seven billion, nine hundred thirty-eight million, one hundred seventy-three thousand, seven hundred two".