78199268639 has 16 divisors (see below), whose sum is σ = 84611520480. Its totient is φ = 72020067840.

The previous prime is 78199268627. The next prime is 78199268657. The reversal of 78199268639 is 93686299187.

It is not a de Polignac number, because 78199268639 - 2³⁶ = 9479791903 is a prime.

It is a super-2 number, since 2×78199268639² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78199268839) 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, 792059 + ... + 885299.

It is an arithmetic number, because the mean of its divisors is an integer number (5288220030).

Almost surely, 2^78199268639 is an apocalyptic number.

78199268639 is a deficient number, since it is larger than the sum of its proper divisors (6412251841).

78199268639 is a wasteful number, since it uses less digits than its factorization.

78199268639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94490.

The product of its digits is 70543872, while the sum is 68.

The spelling of 78199268639 in words is "seventy-eight billion, one hundred ninety-nine million, two hundred sixty-eight thousand, six hundred thirty-nine".