681634 has 8 divisors (see below), whose sum is σ = 1026000. Its totient is φ = 339636.

The previous prime is 681631. The next prime is 681647. The reversal of 681634 is 436186.

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

It is not an unprimeable number, because it can be changed into a prime (681631) 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, 657 + ... + 1339.

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

2⁶⁸¹⁶³⁴ is an apocalyptic number.

681634 is a deficient number, since it is larger than the sum of its proper divisors (344366).

681634 is a wasteful number, since it uses less digits than its factorization.

681634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184.

The product of its digits is 3456, while the sum is 28.

The square root of 681634 is about 825.6112886825. The cubic root of 681634 is about 88.0069725880.

The spelling of 681634 in words is "six hundred eighty-one thousand, six hundred thirty-four".