681493992 has 32 divisors (see below), whose sum is σ = 1707112800. Its totient is φ = 226714304.

The previous prime is 681493963. The next prime is 681493999. The reversal of 681493992 is 299394186.

681493992 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 2×681493992² = 928868122264192128, which contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681493999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15678 + ... + 40109.

It is an arithmetic number, because the mean of its divisors is an integer number (53347275).

Almost surely, 2^681493992 is an apocalyptic number.

It is an amenable number.

681493992 is an abundant number, since it is smaller than the sum of its proper divisors (1025618808).

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

681493992 is a wasteful number, since it uses less digits than its factorization.

681493992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56305 (or 56301 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 681493992 is about 26105.4398928652. The cubic root of 681493992 is about 880.0094661516.

The spelling of 681493992 in words is "six hundred eighty-one million, four hundred ninety-three thousand, nine hundred ninety-two".