78686505944 has 16 divisors (see below), whose sum is σ = 147799262520. Its totient is φ = 39273369280.

The previous prime is 78686505929. The next prime is 78686505967. The reversal of 78686505944 is 44950568687.

It is a super-2 number, since 2×78686505944² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8730677 + ... + 8739684.

Almost surely, 2^78686505944 is an apocalyptic number.

It is an amenable number.

78686505944 is a deficient number, since it is larger than the sum of its proper divisors (69112756576).

78686505944 is a wasteful number, since it uses less digits than its factorization.

78686505944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17470930 (or 17470926 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 78686505944 in words is "seventy-eight billion, six hundred eighty-six million, five hundred five thousand, nine hundred forty-four".