78731315 has 16 divisors (see below), whose sum is σ = 102368448. Its totient is φ = 57783936.

The previous prime is 78731309. The next prime is 78731333. The reversal of 78731315 is 51313787.

It is a cyclic number.

It is not a de Polignac number, because 78731315 - 2⁴ = 78731299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7229 + ... + 14481.

It is an arithmetic number, because the mean of its divisors is an integer number (6398028).

Almost surely, 2^78731315 is an apocalyptic number.

78731315 is a deficient number, since it is larger than the sum of its proper divisors (23637133).

78731315 is a wasteful number, since it uses less digits than its factorization.

78731315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7438.

The product of its digits is 17640, while the sum is 35.

The square root of 78731315 is about 8873.0668317104. The cubic root of 78731315 is about 428.5970410354.

The spelling of 78731315 in words is "seventy-eight million, seven hundred thirty-one thousand, three hundred fifteen".