78900031 has 16 divisors (see below), whose sum is σ = 92731968. Its totient is φ = 65721600.

The previous prime is 78900011. The next prime is 78900037. The reversal of 78900031 is 13000987.

It is not a de Polignac number, because 78900031 - 2⁷ = 78899903 is a prime.

It is a super-2 number, since 2×78900031² = 12450429783601922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78900037) 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, 120501 + ... + 121153.

It is an arithmetic number, because the mean of its divisors is an integer number (5795748).

Almost surely, 2^78900031 is an apocalyptic number.

78900031 is a deficient number, since it is larger than the sum of its proper divisors (13831937).

78900031 is a wasteful number, since it uses less digits than its factorization.

78900031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 78900031 is about 8882.5689414718. The cubic root of 78900031 is about 428.9029743103.

The spelling of 78900031 in words is "seventy-eight million, nine hundred thousand, thirty-one".