681900 has 36 divisors (see below), whose sum is σ = 1973832. Its totient is φ = 181760.

The previous prime is 681899. The next prime is 681913. The reversal of 681900 is 9186.

It is a super-2 number, since 2×681900² = 929975220000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 837 + ... + 1436.

2⁶⁸¹⁹⁰⁰ is an apocalyptic number.

681900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681900 is an abundant number, since it is smaller than the sum of its proper divisors (1291932).

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

681900 is a wasteful number, since it uses less digits than its factorization.

681900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290 (or 2283 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 681900 is about 825.7723657280. The cubic root of 681900 is about 88.0184190095.

The spelling of 681900 in words is "six hundred eighty-one thousand, nine hundred".