78867131 has 16 divisors (see below), whose sum is σ = 98519040. Its totient is φ = 61568640.

The previous prime is 78867121. The next prime is 78867133. The reversal of 78867131 is 13176887.

It is not a de Polignac number, because 78867131 - 2¹⁸ = 78604987 is a prime.

It is a super-2 number, since 2×78867131² = 12440048704342322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78867133) 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, 7001 + ... + 14378.

It is an arithmetic number, because the mean of its divisors is an integer number (6157440).

Almost surely, 2^78867131 is an apocalyptic number.

78867131 is a deficient number, since it is larger than the sum of its proper divisors (19651909).

78867131 is a wasteful number, since it uses less digits than its factorization.

78867131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21434.

The product of its digits is 56448, while the sum is 41.

The square root of 78867131 is about 8880.7168066547. The cubic root of 78867131 is about 428.8433508878.

The spelling of 78867131 in words is "seventy-eight million, eight hundred sixty-seven thousand, one hundred thirty-one".