78870231 has 36 divisors (see below), whose sum is σ = 128573640. Its totient is φ = 46202400.

The previous prime is 78870223. The next prime is 78870241. The reversal of 78870231 is 13207887.

It is not a de Polignac number, because 78870231 - 2³ = 78870223 is a prime.

It is a super-2 number, since 2×78870231² = 12441026675986722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78870221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 94725 + ... + 95553.

It is an arithmetic number, because the mean of its divisors is an integer number (3571490).

Almost surely, 2^78870231 is an apocalyptic number.

78870231 is a deficient number, since it is larger than the sum of its proper divisors (49703409).

78870231 is a wasteful number, since it uses less digits than its factorization.

78870231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78870231 is about 8880.8913404005. The cubic root of 78870231 is about 428.8489696078.

The spelling of 78870231 in words is "seventy-eight million, eight hundred seventy thousand, two hundred thirty-one".