78816313 has 4 divisors (see below), whose sum is σ = 82964560. Its totient is φ = 74668068.

The previous prime is 78816299. The next prime is 78816323. The reversal of 78816313 is 31361887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78816313 - 2⁹ = 78815801 is a prime.

It is a super-2 number, since 2×78816313² = 12424022389827938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78816323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074095 + ... + 2074132.

It is an arithmetic number, because the mean of its divisors is an integer number (20741140).

Almost surely, 2^78816313 is an apocalyptic number.

It is an amenable number.

78816313 is a deficient number, since it is larger than the sum of its proper divisors (4148247).

78816313 is a wasteful number, since it uses less digits than its factorization.

78816313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148246.

The product of its digits is 24192, while the sum is 37.

The square root of 78816313 is about 8877.8552026939. The cubic root of 78816313 is about 428.7512227580.

The spelling of 78816313 in words is "seventy-eight million, eight hundred sixteen thousand, three hundred thirteen".