78717977692 has 48 divisors (see below), whose sum is σ = 150427791360. Its totient is φ = 35897202432.

The previous prime is 78717977659. The next prime is 78717977713. The reversal of 78717977692 is 29677971787.

It is a super-3 number, since 3×78717977692³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265359 + ... + 477337.

It is an arithmetic number, because the mean of its divisors is an integer number (3133912320).

Almost surely, 2^78717977692 is an apocalyptic number.

It is an amenable number.

78717977692 is a deficient number, since it is larger than the sum of its proper divisors (71709813668).

78717977692 is a wasteful number, since it uses less digits than its factorization.

78717977692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212170 (or 212168 counting only the distinct ones).

The product of its digits is 130691232, while the sum is 70.

The spelling of 78717977692 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-seven thousand, six hundred ninety-two".