78531313 has 32 divisors (see below), whose sum is σ = 102297600. Its totient is φ = 58662144.

The previous prime is 78531289. The next prime is 78531367. The reversal of 78531313 is 31313587.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78531313 - 2²⁵ = 44976881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78531413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105898 + ... + 106636.

It is an arithmetic number, because the mean of its divisors is an integer number (3196800).

Almost surely, 2^78531313 is an apocalyptic number.

It is an amenable number.

78531313 is a deficient number, since it is larger than the sum of its proper divisors (23766287).

78531313 is a wasteful number, since it uses less digits than its factorization.

78531313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829.

The product of its digits is 7560, while the sum is 31.

The square root of 78531313 is about 8861.7894919706. The cubic root of 78531313 is about 428.2338100755.

The spelling of 78531313 in words is "seventy-eight million, five hundred thirty-one thousand, three hundred thirteen".