78531316 has 18 divisors (see below), whose sum is σ = 141254358. Its totient is φ = 38201760.

The previous prime is 78531289. The next prime is 78531367. The reversal of 78531316 is 61313587.

It can be written as a sum of positive squares in 3 ways, for example, as 19395216 + 59136100 = 4404^2 + 7690^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1695 + ... + 12646.

Almost surely, 2^78531316 is an apocalyptic number.

It is an amenable number.

78531316 is a deficient number, since it is larger than the sum of its proper divisors (62723042).

78531316 is a wasteful number, since it uses less digits than its factorization.

78531316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14419 (or 14380 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 78531316 is about 8861.7896612366. The cubic root of 78531316 is about 428.2338155285.

The spelling of 78531316 in words is "seventy-eight million, five hundred thirty-one thousand, three hundred sixteen".