78426931 has 16 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 68695200.

The previous prime is 78426923. The next prime is 78426947. The reversal of 78426931 is 13962487.

It is a cyclic number.

It is not a de Polignac number, because 78426931 - 2³ = 78426923 is a prime.

It is a super-2 number, since 2×78426931² = 12301567012157522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78426331) 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, 118680 + ... + 119338.

It is an arithmetic number, because the mean of its divisors is an integer number (5544000).

Almost surely, 2^78426931 is an apocalyptic number.

78426931 is a deficient number, since it is larger than the sum of its proper divisors (10277069).

78426931 is a wasteful number, since it uses less digits than its factorization.

78426931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its digits is 72576, while the sum is 40.

The square root of 78426931 is about 8855.8980911029. The cubic root of 78426931 is about 428.0439931342.

The spelling of 78426931 in words is "seventy-eight million, four hundred twenty-six thousand, nine hundred thirty-one".