78715085731 has 16 divisors (see below), whose sum is σ = 83058393600. Its totient is φ = 74392064928.

The previous prime is 78715085723. The next prime is 78715085753. The reversal of 78715085731 is 13758051787.

It is a cyclic number.

It is not a de Polignac number, because 78715085731 - 2³ = 78715085723 is a prime.

It is a super-2 number, since 2×78715085731² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78715085531) 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, 15731076 + ... + 15736078.

It is an arithmetic number, because the mean of its divisors is an integer number (5191149600).

Almost surely, 2^78715085731 is an apocalyptic number.

78715085731 is a deficient number, since it is larger than the sum of its proper divisors (4343307869).

78715085731 is a wasteful number, since it uses less digits than its factorization.

78715085731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6858.

The product of its (nonzero) digits is 1646400, while the sum is 52.

The spelling of 78715085731 in words is "seventy-eight billion, seven hundred fifteen million, eighty-five thousand, seven hundred thirty-one".