78365538 has 24 divisors (see below), whose sum is σ = 178729200. Its totient is φ = 24746904.

The previous prime is 78365533. The next prime is 78365653. The reversal of 78365538 is 83556387.

It is a super-2 number, since 2×78365538² = 12282315092058888, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78365493 and 78365502.

It is not an unprimeable number, because it can be changed into a prime (78365533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114228 + ... + 114911.

It is an arithmetic number, because the mean of its divisors is an integer number (7447050).

Almost surely, 2^78365538 is an apocalyptic number.

78365538 is an abundant number, since it is smaller than the sum of its proper divisors (100363662).

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

78365538 is a wasteful number, since it uses less digits than its factorization.

78365538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229166 (or 229163 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 78365538 is about 8852.4311914863. The cubic root of 78365538 is about 427.9322723064.

The spelling of 78365538 in words is "seventy-eight million, three hundred sixty-five thousand, five hundred thirty-eight".