779334930640 has 160 divisors (see below), whose sum is σ = 2122179171840. Its totient is φ = 260576870400.

The previous prime is 779334930617. The next prime is 779334930653. The reversal of 779334930640 is 46039433977.

It is a super-2 number, since 2×779334930640² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72754885 + ... + 72765595.

It is an arithmetic number, because the mean of its divisors is an integer number (13263619824).

Almost surely, 2^779334930640 is an apocalyptic number.

779334930640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 779334930640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061089585920).

779334930640 is an abundant number, since it is smaller than the sum of its proper divisors (1342844241200).

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

779334930640 is a wasteful number, since it uses less digits than its factorization.

779334930640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13941 (or 13935 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 55.

The spelling of 779334930640 in words is "seven hundred seventy-nine billion, three hundred thirty-four million, nine hundred thirty thousand, six hundred forty".