78591992 has 16 divisors (see below), whose sum is σ = 147494400. Its totient is φ = 39260160.

The previous prime is 78591991. The next prime is 78592021. The reversal of 78591992 is 29919587.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78591992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78591991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6392 + ... + 14072.

It is an arithmetic number, because the mean of its divisors is an integer number (9218400).

Almost surely, 2^78591992 is an apocalyptic number.

It is an amenable number.

78591992 is a deficient number, since it is larger than the sum of its proper divisors (68902408).

78591992 is a wasteful number, since it uses less digits than its factorization.

78591992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966 (or 8962 counting only the distinct ones).

The product of its digits is 408240, while the sum is 50.

The square root of 78591992 is about 8865.2124622030. The cubic root of 78591992 is about 428.3440765355.

The spelling of 78591992 in words is "seventy-eight million, five hundred ninety-one thousand, nine hundred ninety-two".