78998031 has 64 divisors (see below), whose sum is σ = 147916800. Its totient is φ = 40601088.

The previous prime is 78998027. The next prime is 78998033. The reversal of 78998031 is 13089987.

It is not a de Polignac number, because 78998031 - 2² = 78998027 is a prime.

It is a super-2 number, since 2×78998031² = 12481377803753922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78998033) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73365 + ... + 74433.

It is an arithmetic number, because the mean of its divisors is an integer number (2311200).

Almost surely, 2^78998031 is an apocalyptic number.

78998031 is a deficient number, since it is larger than the sum of its proper divisors (68918769).

78998031 is a wasteful number, since it uses less digits than its factorization.

78998031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 78998031 is about 8888.0836517216. The cubic root of 78998031 is about 429.0804778355.

The spelling of 78998031 in words is "seventy-eight million, nine hundred ninety-eight thousand, thirty-one".