779840639056 has 80 divisors (see below), whose sum is σ = 1604084546304. Its totient is φ = 366006915072.

The previous prime is 779840639023. The next prime is 779840639129. The reversal of 779840639056 is 650936048977.

It is a happy number.

It is a super-2 number, since 2×779840639056² (a number of 25 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 15 ways as a sum of consecutive naturals, for example, 327250441 + ... + 327252823.

Almost surely, 2^779840639056 is an apocalyptic number.

It is an amenable number.

779840639056 is an abundant number, since it is smaller than the sum of its proper divisors (824243907248).

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

779840639056 is a wasteful number, since it uses less digits than its factorization.

779840639056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108 (or 5102 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 779840639056 in words is "seven hundred seventy-nine billion, eight hundred forty million, six hundred thirty-nine thousand, fifty-six".