78972313 has 8 divisors (see below), whose sum is σ = 91098432. Its totient is φ = 67057296.

The previous prime is 78972301. The next prime is 78972329. The reversal of 78972313 is 31327987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78972313 - 2¹³ = 78964121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78972013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51970 + ... + 53467.

It is an arithmetic number, because the mean of its divisors is an integer number (11387304).

Almost surely, 2^78972313 is an apocalyptic number.

It is an amenable number.

78972313 is a deficient number, since it is larger than the sum of its proper divisors (12126119).

78972313 is a wasteful number, since it uses less digits than its factorization.

78972313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105551.

The product of its digits is 63504, while the sum is 40.

The square root of 78972313 is about 8886.6367653911. The cubic root of 78972313 is about 429.0339100527.

The spelling of 78972313 in words is "seventy-eight million, nine hundred seventy-two thousand, three hundred thirteen".