779980 has 24 divisors (see below), whose sum is σ = 1668240. Its totient is φ = 306240.

The previous prime is 779971. The next prime is 779981. The reversal of 779980 is 89977.

It is not an unprimeable number, because it can be changed into a prime (779981) 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, 850 + ... + 1510.

It is an arithmetic number, because the mean of its divisors is an integer number (69510).

2⁷⁷⁹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

779980 is an abundant number, since it is smaller than the sum of its proper divisors (888260).

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

779980 is a wasteful number, since it uses less digits than its factorization.

779980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 779980 is about 883.1647637899. The cubic root of 779980 is about 92.0508540523.

The spelling of 779980 in words is "seven hundred seventy-nine thousand, nine hundred eighty".