78537794236 has 24 divisors (see below), whose sum is σ = 152047566720. Its totient is φ = 35196193200.

The previous prime is 78537794213. The next prime is 78537794263. The reversal of 78537794236 is 63249773587.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12566946 + ... + 12573193.

It is an arithmetic number, because the mean of its divisors is an integer number (6335315280).

Almost surely, 2^78537794236 is an apocalyptic number.

It is an amenable number.

78537794236 is a deficient number, since it is larger than the sum of its proper divisors (73509772484).

78537794236 is a wasteful number, since it uses less digits than its factorization.

78537794236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25140225 (or 25140223 counting only the distinct ones).

The product of its digits is 53343360, while the sum is 61.

The spelling of 78537794236 in words is "seventy-eight billion, five hundred thirty-seven million, seven hundred ninety-four thousand, two hundred thirty-six".