78997712 has 20 divisors (see below), whose sum is σ = 153918720. Its totient is φ = 39276768.

The previous prime is 78997697. The next prime is 78997717. The reversal of 78997712 is 21779987.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78997717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10928 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (7695936).

Almost surely, 2^78997712 is an apocalyptic number.

It is an amenable number.

78997712 is a deficient number, since it is larger than the sum of its proper divisors (74921008).

78997712 is a wasteful number, since it uses less digits than its factorization.

78997712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27770 (or 27764 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 78997712 is about 8888.0657063278. The cubic root of 78997712 is about 429.0799002817.

The spelling of 78997712 in words is "seventy-eight million, nine hundred ninety-seven thousand, seven hundred twelve".