681662 has 8 divisors (see below), whose sum is σ = 1026000. Its totient is φ = 339664.

The previous prime is 681647. The next prime is 681673. The reversal of 681662 is 266186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

681662 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839 + ... + 1437.

It is an arithmetic number, because the mean of its divisors is an integer number (128250).

2⁶⁸¹⁶⁶² is an apocalyptic number.

681662 is a deficient number, since it is larger than the sum of its proper divisors (344338).

681662 is a wasteful number, since it uses less digits than its factorization.

681662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its digits is 3456, while the sum is 29.

The square root of 681662 is about 825.6282456409. The cubic root of 681662 is about 88.0081776147.

The spelling of 681662 in words is "six hundred eighty-one thousand, six hundred sixty-two".