78207920694 has 24 divisors (see below), whose sum is σ = 176817908592. Its totient is φ = 24935858640.

The previous prime is 78207920677. The next prime is 78207920699. The reversal of 78207920694 is 49602970287.

It is a super-2 number, since 2×78207920694² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78207920694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78207920699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94453597 + ... + 94454424.

It is an arithmetic number, because the mean of its divisors is an integer number (7367412858).

Almost surely, 2^78207920694 is an apocalyptic number.

78207920694 is an abundant number, since it is smaller than the sum of its proper divisors (98609987898).

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

78207920694 is a wasteful number, since it uses less digits than its factorization.

78207920694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188908052 (or 188908049 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 78207920694 in words is "seventy-eight billion, two hundred seven million, nine hundred twenty thousand, six hundred ninety-four".