78717979694 has 16 divisors (see below), whose sum is σ = 118428892128. Its totient is φ = 39241832832.

The previous prime is 78717979693. The next prime is 78717979721. The reversal of 78717979694 is 49697971787.

It is a happy number.

It is a super-3 number, since 3×78717979694³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78717979693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031642 + ... + 1105314.

It is an arithmetic number, because the mean of its divisors is an integer number (7401805758).

Almost surely, 2^78717979694 is an apocalyptic number.

78717979694 is a deficient number, since it is larger than the sum of its proper divisors (39710912434).

78717979694 is a wasteful number, since it uses less digits than its factorization.

78717979694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75259.

The product of its digits is 336063168, while the sum is 74.

The spelling of 78717979694 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-nine thousand, six hundred ninety-four".