78739612 has 12 divisors (see below), whose sum is σ = 157479280. Its totient is φ = 33745536.

The previous prime is 78739567. The next prime is 78739613. The reversal of 78739612 is 21693787.

It is a happy number.

78739612 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78739613) 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 3 ways as a sum of consecutive naturals, for example, 1406037 + ... + 1406092.

Almost surely, 2^78739612 is an apocalyptic number.

It is an amenable number.

78739612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78739612 is a wasteful number, since it uses less digits than its factorization.

78739612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812140 (or 2812138 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 78739612 is about 8873.5343578531. The cubic root of 78739612 is about 428.6120962255.

The spelling of 78739612 in words is "seventy-eight million, seven hundred thirty-nine thousand, six hundred twelve".