78400861392 has 160 divisors (see below), whose sum is σ = 255741345792. Its totient is φ = 20165916672.

The previous prime is 78400861367. The next prime is 78400861397. The reversal of 78400861392 is 29316800487.

It is a super-2 number, since 2×78400861392² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78400861397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167008 + ... + 429759.

Almost surely, 2^78400861392 is an apocalyptic number.

It is an amenable number.

78400861392 is an abundant number, since it is smaller than the sum of its proper divisors (177340484400).

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

78400861392 is a wasteful number, since it uses less digits than its factorization.

78400861392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596825 (or 596819 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 78400861392 in words is "seventy-eight billion, four hundred million, eight hundred sixty-one thousand, three hundred ninety-two".