779336640 has 280 divisors, whose sum is σ = 2808104112. Its totient is φ = 205148160.

The previous prime is 779336629. The next prime is 779336641. The reversal of 779336640 is 46633977.

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 (779336641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2773300 + ... + 2773580.

Almost surely, 2^779336640 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 779336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404052056).

779336640 is an abundant number, since it is smaller than the sum of its proper divisors (2028767472).

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

779336640 is a wasteful number, since it uses less digits than its factorization.

779336640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 45.

The square root of 779336640 is about 27916.6015123618. The cubic root of 779336640 is about 920.2553796391.

The spelling of 779336640 in words is "seven hundred seventy-nine million, three hundred thirty-six thousand, six hundred forty".