779489820 has 144 divisors (see below), whose sum is σ = 2512167840. Its totient is φ = 195084288.

The previous prime is 779489807. The next prime is 779489863. The reversal of 779489820 is 28984977.

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, 385452 + ... + 387468.

It is an arithmetic number, because the mean of its divisors is an integer number (17445610).

Almost surely, 2^779489820 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 779489820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1256083920).

779489820 is an abundant number, since it is smaller than the sum of its proper divisors (1732678020).

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

779489820 is a wasteful number, since it uses less digits than its factorization.

779489820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 2159 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 779489820 is about 27919.3449063548. The cubic root of 779489820 is about 920.3156682988.

The spelling of 779489820 in words is "seven hundred seventy-nine million, four hundred eighty-nine thousand, eight hundred twenty".