7811686680 has 64 divisors (see below), whose sum is σ = 26782928640. Its totient is φ = 1785528192.

The previous prime is 7811686667. The next prime is 7811686691. The reversal of 7811686680 is 866861187.

It is a super-2 number, since 2×7811686680² (a number of 21 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 15 ways as a sum of consecutive naturals, for example, 4648974 + ... + 4650653.

It is an arithmetic number, because the mean of its divisors is an integer number (418483260).

Almost surely, 2^7811686680 is an apocalyptic number.

7811686680 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7811686680 is an abundant number, since it is smaller than the sum of its proper divisors (18971241960).

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

7811686680 is a wasteful number, since it uses less digits than its factorization.

7811686680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9299648 (or 9299644 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 7811686680 is about 88383.7466958716. The cubic root of 7811686680 is about 1984.1824557694.

The spelling of 7811686680 in words is "seven billion, eight hundred eleven million, six hundred eighty-six thousand, six hundred eighty".