779280880 has 40 divisors (see below), whose sum is σ = 2070662112. Its totient is φ = 267181824.

The previous prime is 779280863. The next prime is 779280881. The reversal of 779280880 is 88082977.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) 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 (779280881) 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, 695227 + ... + 696346.

Almost surely, 2^779280880 is an apocalyptic number.

779280880 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

779280880 is an abundant number, since it is smaller than the sum of its proper divisors (1291381232).

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

779280880 is a wasteful number, since it uses less digits than its factorization.

779280880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391593 (or 1391587 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 779280880 is about 27915.6028055996. The cubic root of 779280880 is about 920.2334316296.

The spelling of 779280880 in words is "seven hundred seventy-nine million, two hundred eighty thousand, eight hundred eighty".