78336531 has 32 divisors (see below), whose sum is σ = 142840320. Its totient is φ = 41319072.

The previous prime is 78336499. The next prime is 78336539. The reversal of 78336531 is 13563387.

It is not a de Polignac number, because 78336531 - 2⁵ = 78336499 is a prime.

It is a super-2 number, since 2×78336531² = 12273224178227922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78336539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13485 + ... + 18398.

It is an arithmetic number, because the mean of its divisors is an integer number (4463760).

Almost surely, 2^78336531 is an apocalyptic number.

78336531 is a deficient number, since it is larger than the sum of its proper divisors (64503789).

78336531 is a wasteful number, since it uses less digits than its factorization.

78336531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31912 (or 31906 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 78336531 is about 8850.7926763652. The cubic root of 78336531 is about 427.8794660874.

The spelling of 78336531 in words is "seventy-eight million, three hundred thirty-six thousand, five hundred thirty-one".