681672 has 16 divisors (see below), whose sum is σ = 1704240. Its totient is φ = 227216.

The previous prime is 681647. The next prime is 681673. The reversal of 681672 is 276186.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (681673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14178 + ... + 14225.

It is an arithmetic number, because the mean of its divisors is an integer number (106515).

2⁶⁸¹⁶⁷² is an apocalyptic number.

It is an amenable number.

681672 is an abundant number, since it is smaller than the sum of its proper divisors (1022568).

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

681672 is a wasteful number, since it uses less digits than its factorization.

681672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28412 (or 28408 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 681672 is about 825.6343016130. The cubic root of 681672 is about 88.0086079734.

The spelling of 681672 in words is "six hundred eighty-one thousand, six hundred seventy-two".