78868531 has 8 divisors (see below), whose sum is σ = 90741600. Its totient is φ = 67147008.

The previous prime is 78868519. The next prime is 78868597. The reversal of 78868531 is 13586887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78868531 - 2⁵ = 78868499 is a prime.

It is a super-2 number, since 2×78868531² = 12440490364195922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78868501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36766 + ... + 38851.

It is an arithmetic number, because the mean of its divisors is an integer number (11342700).

Almost surely, 2^78868531 is an apocalyptic number.

78868531 is a deficient number, since it is larger than the sum of its proper divisors (11873069).

78868531 is a wasteful number, since it uses less digits than its factorization.

78868531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75773.

The product of its digits is 322560, while the sum is 46.

The square root of 78868531 is about 8880.7956287711. The cubic root of 78868531 is about 428.8458883925.

The spelling of 78868531 in words is "seventy-eight million, eight hundred sixty-eight thousand, five hundred thirty-one".