779903640 has 384 divisors, whose sum is σ = 2861913600. Its totient is φ = 190356480.

The previous prime is 779903629. The next prime is 779903647. The reversal of 779903640 is 46309977.

779903640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779903647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7571829 + ... + 7571931.

It is an arithmetic number, because the mean of its divisors is an integer number (7452900).

Almost surely, 2^779903640 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 779903640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430956800).

779903640 is an abundant number, since it is smaller than the sum of its proper divisors (2082009960).

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

779903640 is a wasteful number, since it uses less digits than its factorization.

779903640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 779903640 is about 27926.7549135233. The cubic root of 779903640 is about 920.4785002969.

The spelling of 779903640 in words is "seven hundred seventy-nine million, nine hundred three thousand, six hundred forty".