78938523 has 16 divisors (see below), whose sum is σ = 117985440. Its totient is φ = 52157952.

The previous prime is 78938513. The next prime is 78938527. The reversal of 78938523 is 32583987.

It is not a de Polignac number, because 78938523 - 2⁹ = 78938011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78938527) 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, 9886 + ... + 15987.

It is an arithmetic number, because the mean of its divisors is an integer number (7374090).

Almost surely, 2^78938523 is an apocalyptic number.

78938523 is a deficient number, since it is larger than the sum of its proper divisors (39046917).

78938523 is a wasteful number, since it uses less digits than its factorization.

78938523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25995 (or 25989 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 78938523 is about 8884.7353927959. The cubic root of 78938523 is about 428.9727108662.

The spelling of 78938523 in words is "seventy-eight million, nine hundred thirty-eight thousand, five hundred twenty-three".