681976 has 8 divisors (see below), whose sum is σ = 1278720. Its totient is φ = 340984.

The previous prime is 681971. The next prime is 681977. The reversal of 681976 is 679186.

681976 = T₁₄₄ + T₁₄₅ + ... + T₁₉₁.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42616 + ... + 42631.

It is an arithmetic number, because the mean of its divisors is an integer number (159840).

2⁶⁸¹⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

681976 is a deficient number, since it is larger than the sum of its proper divisors (596744).

681976 is a wasteful number, since it uses less digits than its factorization.

681976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85253 (or 85249 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 681976 is about 825.8183819703. The cubic root of 681976 is about 88.0216888689.

The spelling of 681976 in words is "six hundred eighty-one thousand, nine hundred seventy-six".