779977728 has 88 divisors (see below), whose sum is σ = 2309998560. Its totient is φ = 259983360.

The previous prime is 779977703. The next prime is 779977729. The reversal of 779977728 is 827779977.

It is not an unprimeable number, because it can be changed into a prime (779977729) 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, 13543 + ... + 41753.

Almost surely, 2^779977728 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 779977728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154999280).

779977728 is an abundant number, since it is smaller than the sum of its proper divisors (1530020832).

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

779977728 is a wasteful number, since it uses less digits than its factorization.

779977728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28240 (or 28216 counting only the distinct ones).

The product of its digits is 21781872, while the sum is 63.

The square root of 779977728 is about 27928.0813519296. The cubic root of 779977728 is about 920.5076467402.

The spelling of 779977728 in words is "seven hundred seventy-nine million, nine hundred seventy-seven thousand, seven hundred twenty-eight".