78456231 has 24 divisors (see below), whose sum is σ = 129752064. Its totient is φ = 44750160.

The previous prime is 78456229. The next prime is 78456251. The reversal of 78456231 is 13265487.

It is not a de Polignac number, because 78456231 - 2¹ = 78456229 is a prime.

It is a super-2 number, since 2×78456231² = 12310760365450722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78456211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56710 + ... + 58076.

It is an arithmetic number, because the mean of its divisors is an integer number (5406336).

Almost surely, 2^78456231 is an apocalyptic number.

78456231 is a deficient number, since it is larger than the sum of its proper divisors (51295833).

78456231 is a wasteful number, since it uses less digits than its factorization.

78456231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291 (or 2288 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 78456231 is about 8857.5522013703. The cubic root of 78456231 is about 428.0972916942.

It can be divided in two parts, 78456 and 231, that added together give a palindrome (78687).

The spelling of 78456231 in words is "seventy-eight million, four hundred fifty-six thousand, two hundred thirty-one".