78945138 has 32 divisors (see below), whose sum is σ = 176529600. Its totient is φ = 26150688.

The previous prime is 78945137. The next prime is 78945149. The reversal of 78945138 is 83154987.

It is a junction number, because it is equal to n+sod(n) for n = 78945093 and 78945102.

It is not an unprimeable number, because it can be changed into a prime (78945137) 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, 4318 + ... + 13286.

It is an arithmetic number, because the mean of its divisors is an integer number (5516550).

Almost surely, 2^78945138 is an apocalyptic number.

78945138 is an abundant number, since it is smaller than the sum of its proper divisors (97584462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78945138 is a wasteful number, since it uses less digits than its factorization.

78945138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9143 (or 9137 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 78945138 is about 8885.1076526962. The cubic root of 78945138 is about 428.9846930819.

The spelling of 78945138 in words is "seventy-eight million, nine hundred forty-five thousand, one hundred thirty-eight".