779696640 has 240 divisors, whose sum is σ = 2766617568. Its totient is φ = 202825728.

The previous prime is 779696633. The next prime is 779696657. The reversal of 779696640 is 46696977.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 990327 + ... + 991113.

Almost surely, 2^779696640 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 779696640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383308784).

779696640 is an abundant number, since it is smaller than the sum of its proper divisors (1986920928).

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

779696640 is a wasteful number, since it uses less digits than its factorization.

779696640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The square root of 779696640 is about 27923.0485441687. The cubic root of 779696640 is about 920.3970560860.

The spelling of 779696640 in words is "seven hundred seventy-nine million, six hundred ninety-six thousand, six hundred forty".