78316731 has 12 divisors (see below), whose sum is σ = 113278152. Its totient is φ = 52140096.

The previous prime is 78316723. The next prime is 78316811. The reversal of 78316731 is 13761387.

It is not a de Polignac number, because 78316731 - 2³ = 78316723 is a prime.

It is a super-2 number, since 2×78316731² = 12267020709052722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78316031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1555 + ... + 12611.

It is an arithmetic number, because the mean of its divisors is an integer number (9439846).

Almost surely, 2^78316731 is an apocalyptic number.

78316731 is a deficient number, since it is larger than the sum of its proper divisors (34961421).

78316731 is a wasteful number, since it uses less digits than its factorization.

78316731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11850 (or 11847 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 78316731 is about 8849.6740617946. The cubic root of 78316731 is about 427.8434134003.

The spelling of 78316731 in words is "seventy-eight million, three hundred sixteen thousand, seven hundred thirty-one".