78921318 has 16 divisors (see below), whose sum is σ = 180391680. Its totient is φ = 22548936.

The previous prime is 78921301. The next prime is 78921329. The reversal of 78921318 is 81312987.

It is a congruent number.

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, 939498 + ... + 939581.

It is an arithmetic number, because the mean of its divisors is an integer number (11274480).

Almost surely, 2^78921318 is an apocalyptic number.

78921318 is an abundant number, since it is smaller than the sum of its proper divisors (101470362).

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

78921318 is a wasteful number, since it uses less digits than its factorization.

78921318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879091.

The product of its digits is 24192, while the sum is 39.

The square root of 78921318 is about 8883.7671063575. The cubic root of 78921318 is about 428.9415431023.

The spelling of 78921318 in words is "seventy-eight million, nine hundred twenty-one thousand, three hundred eighteen".