78831372 has 24 divisors (see below), whose sum is σ = 184098096. Its totient is φ = 26254528.

The previous prime is 78831343. The next prime is 78831383. The reversal of 78831372 is 27313887.

It is a super-2 number, since 2×78831372² = 12428770422804768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78831372.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17638 + ... + 21650.

It is an arithmetic number, because the mean of its divisors is an integer number (7670754).

Almost surely, 2^78831372 is an apocalyptic number.

It is an amenable number.

78831372 is an abundant number, since it is smaller than the sum of its proper divisors (105266724).

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

78831372 is a wasteful number, since it uses less digits than its factorization.

78831372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657 (or 5655 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 78831372 is about 8878.7032837008. The cubic root of 78831372 is about 428.7785273995.

The spelling of 78831372 in words is "seventy-eight million, eight hundred thirty-one thousand, three hundred seventy-two".