78978512 has 20 divisors (see below), whose sum is σ = 154960320. Its totient is φ = 38988768.

The previous prime is 78978509. The next prime is 78978541. The reversal of 78978512 is 21587987.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 29978 + ... + 32505.

It is an arithmetic number, because the mean of its divisors is an integer number (7748016).

Almost surely, 2^78978512 is an apocalyptic number.

It is an amenable number.

78978512 is a deficient number, since it is larger than the sum of its proper divisors (75981808).

78978512 is a wasteful number, since it uses less digits than its factorization.

78978512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62570 (or 62564 counting only the distinct ones).

The product of its digits is 282240, while the sum is 47.

The square root of 78978512 is about 8886.9855406656. The cubic root of 78978512 is about 429.0451355550.

The spelling of 78978512 in words is "seventy-eight million, nine hundred seventy-eight thousand, five hundred twelve".