78297117039 has 12 divisors (see below), whose sum is σ = 119748532176. Its totient is φ = 49127602752.

The previous prime is 78297117007. The next prime is 78297117047. The reversal of 78297117039 is 93071179287.

It is not a de Polignac number, because 78297117039 - 2⁵ = 78297117007 is a prime.

It is a super-2 number, since 2×78297117039² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297116039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255872779 + ... + 255873084.

It is an arithmetic number, because the mean of its divisors is an integer number (9979044348).

Almost surely, 2^78297117039 is an apocalyptic number.

78297117039 is a deficient number, since it is larger than the sum of its proper divisors (41451415137).

78297117039 is a wasteful number, since it uses less digits than its factorization.

78297117039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511745886 (or 511745883 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The spelling of 78297117039 in words is "seventy-eight billion, two hundred ninety-seven million, one hundred seventeen thousand, thirty-nine".