779797980 has 144 divisors (see below), whose sum is σ = 2658277440. Its totient is φ = 183591936.

The previous prime is 779797969. The next prime is 779798011. The reversal of 779797980 is 89797977.

It is a super-2 number, since 2×779797980² = 1216169779224160800, which 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 47 ways as a sum of consecutive naturals, for example, 46576 + ... + 61064.

It is an arithmetic number, because the mean of its divisors is an integer number (18460260).

Almost surely, 2^779797980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 779797980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1329138720).

779797980 is an abundant number, since it is smaller than the sum of its proper divisors (1878479460).

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

779797980 is a wasteful number, since it uses less digits than its factorization.

779797980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14540 (or 14535 counting only the distinct ones).

The product of its (nonzero) digits is 14002632, while the sum is 63.

The square root of 779797980 is about 27924.8631151524. The cubic root of 779797980 is about 920.4369301397.

The spelling of 779797980 in words is "seven hundred seventy-nine million, seven hundred ninety-seven thousand, nine hundred eighty".