78427686492 has 36 divisors (see below), whose sum is σ = 198375559200. Its totient is φ = 26125709952.

The previous prime is 78427686473. The next prime is 78427686497. The reversal of 78427686492 is 29468672487.

78427686492 is a `hidden beast` number, since 7 + 8 + 427 + 68 + 64 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427686497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 645492 + ... + 757307.

It is an arithmetic number, because the mean of its divisors is an integer number (5510432200).

Almost surely, 2^78427686492 is an apocalyptic number.

It is an amenable number.

78427686492 is an abundant number, since it is smaller than the sum of its proper divisors (119947872708).

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

78427686492 is a wasteful number, since it uses less digits than its factorization.

78427686492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404362 (or 1404357 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 63.

The spelling of 78427686492 in words is "seventy-eight billion, four hundred twenty-seven million, six hundred eighty-six thousand, four hundred ninety-two".