681963876 has 36 divisors (see below), whose sum is σ = 1880568144. Its totient is φ = 206655600.

The previous prime is 681963859. The next prime is 681963881. The reversal of 681963876 is 678369186.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 860670 + ... + 861461.

It is an arithmetic number, because the mean of its divisors is an integer number (52238004).

Almost surely, 2^681963876 is an apocalyptic number.

681963876 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

681963876 is an abundant number, since it is smaller than the sum of its proper divisors (1198604268).

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

681963876 is a wasteful number, since it uses less digits than its factorization.

681963876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722152 (or 1722147 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 681963876 is about 26114.4380755168. The cubic root of 681963876 is about 880.2116725657.

The spelling of 681963876 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, eight hundred seventy-six".