780716681640 has 192 divisors, whose sum is σ = 2934743011200. Its totient is φ = 176299485696.

The previous prime is 780716681539. The next prime is 780716681663. The reversal of 780716681640 is 46186617087.

780716681640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×780716681640² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1657155 + ... + 2075474.

It is an arithmetic number, because the mean of its divisors is an integer number (15285119850).

Almost surely, 2^780716681640 is an apocalyptic number.

780716681640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

780716681640 is an abundant number, since it is smaller than the sum of its proper divisors (2154026329560).

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

780716681640 is a wasteful number, since it uses less digits than its factorization.

780716681640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732736 (or 3732729 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 780716681640 in words is "seven hundred eighty billion, seven hundred sixteen million, six hundred eighty-one thousand, six hundred forty".