78112317 has 4 divisors (see below), whose sum is σ = 104149760. Its totient is φ = 52074876.

The previous prime is 78112313. The next prime is 78112337. The reversal of 78112317 is 71321187.

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 not a de Polignac number, because 78112317 - 2² = 78112313 is a prime.

It is a super-2 number, since 2×78112317² = 12203068134216978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78112313) 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, 13018717 + ... + 13018722.

It is an arithmetic number, because the mean of its divisors is an integer number (26037440).

Almost surely, 2^78112317 is an apocalyptic number.

It is an amenable number.

78112317 is a deficient number, since it is larger than the sum of its proper divisors (26037443).

78112317 is a wasteful number, since it uses less digits than its factorization.

78112317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26037442.

The product of its digits is 2352, while the sum is 30.

The square root of 78112317 is about 8838.1172768865. The cubic root of 78112317 is about 427.4708519506.

The spelling of 78112317 in words is "seventy-eight million, one hundred twelve thousand, three hundred seventeen".