78009231 has 16 divisors (see below), whose sum is σ = 109987200. Its totient is φ = 49043808.

The previous prime is 78009227. The next prime is 78009241. The reversal of 78009231 is 13290087.

It is a happy number.

It is not a de Polignac number, because 78009231 - 2² = 78009227 is a prime.

It is a super-2 number, since 2×78009231² = 12170880242422722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78009221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9925 + ... + 15953.

It is an arithmetic number, because the mean of its divisors is an integer number (6874200).

Almost surely, 2^78009231 is an apocalyptic number.

78009231 is a deficient number, since it is larger than the sum of its proper divisors (31977969).

78009231 is a wasteful number, since it uses less digits than its factorization.

78009231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 78009231 is about 8832.2834533319. The cubic root of 78009231 is about 427.2827225956.

The spelling of 78009231 in words is "seventy-eight million, nine thousand, two hundred thirty-one".