78394603686 has 64 divisors (see below), whose sum is σ = 179814683136. Its totient is φ = 22320230400.

The previous prime is 78394603681. The next prime is 78394603691. The reversal of 78394603686 is 68630649387.

It is an interprime number because it is at equal distance from previous prime (78394603681) and next prime (78394603691).

It is a super-2 number, since 2×78394603686² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78394603681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15698406 + ... + 15703398.

It is an arithmetic number, because the mean of its divisors is an integer number (2809604424).

Almost surely, 2^78394603686 is an apocalyptic number.

78394603686 is an abundant number, since it is smaller than the sum of its proper divisors (101420079450).

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

78394603686 is a wasteful number, since it uses less digits than its factorization.

78394603686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6237.

The product of its (nonzero) digits is 31352832, while the sum is 60.

The spelling of 78394603686 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred eighty-six".