681964 has 12 divisors (see below), whose sum is σ = 1234800. Its totient is φ = 329168.

The previous prime is 681949. The next prime is 681971. The reversal of 681964 is 469186.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2824 + ... + 3055.

It is an arithmetic number, because the mean of its divisors is an integer number (102900).

2⁶⁸¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

681964 is a deficient number, since it is larger than the sum of its proper divisors (552836).

681964 is a wasteful number, since it uses less digits than its factorization.

681964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912 (or 5910 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 681964 is about 825.8111164183. The cubic root of 681964 is about 88.0211725915.

The spelling of 681964 in words is "six hundred eighty-one thousand, nine hundred sixty-four".