78994531 has 16 divisors (see below), whose sum is σ = 99601920. Its totient is φ = 60857280.

The previous prime is 78994523. The next prime is 78994537. The reversal of 78994531 is 13549987.

It is a happy number.

It is not a de Polignac number, because 78994531 - 2³ = 78994523 is a prime.

It is a super-2 number, since 2×78994531² = 12480271855819922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78994537) 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, 1090 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (6225120).

Almost surely, 2^78994531 is an apocalyptic number.

78994531 is a deficient number, since it is larger than the sum of its proper divisors (20607389).

78994531 is a wasteful number, since it uses less digits than its factorization.

78994531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11634.

The product of its digits is 272160, while the sum is 46.

The square root of 78994531 is about 8887.8867567043. The cubic root of 78994531 is about 429.0741409525.

The spelling of 78994531 in words is "seventy-eight million, nine hundred ninety-four thousand, five hundred thirty-one".