689904 has 40 divisors (see below), whose sum is σ = 1981520. Its totient is φ = 229824.

The previous prime is 689903. The next prime is 689917. The reversal of 689904 is 409986.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367 + ... + 1230.

It is an arithmetic number, because the mean of its divisors is an integer number (49538).

2⁶⁸⁹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

689904 is an abundant number, since it is smaller than the sum of its proper divisors (1291616).

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

689904 is a wasteful number, since it uses less digits than its factorization.

689904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1602 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 689904 is about 830.6045990723. The cubic root of 689904 is about 88.3614609211.

The spelling of 689904 in words is "six hundred eighty-nine thousand, nine hundred four".