779385840 has 80 divisors (see below), whose sum is σ = 2423642496. Its totient is φ = 207187200.

The previous prime is 779385809. The next prime is 779385877. The reversal of 779385840 is 48583977.

It is a tau number, because it is divible by the number of its divisors (80).

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, 74535 + ... + 84345.

Almost surely, 2^779385840 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 779385840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211821248).

779385840 is an abundant number, since it is smaller than the sum of its proper divisors (1644256656).

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

779385840 is a wasteful number, since it uses less digits than its factorization.

779385840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10158 (or 10152 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 51.

The square root of 779385840 is about 27917.4826945411. The cubic root of 779385840 is about 920.2747446604.

The spelling of 779385840 in words is "seven hundred seventy-nine million, three hundred eighty-five thousand, eight hundred forty".