690804 has 36 divisors (see below), whose sum is σ = 1805440. Its totient is φ = 222480.

The previous prime is 690793. The next prime is 690817. The reversal of 690804 is 408096.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690804.

It is an unprimeable number.

690804 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 11 ways as a sum of consecutive naturals, for example, 807 + ... + 1425.

2⁶⁹⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902720).

690804 is an abundant number, since it is smaller than the sum of its proper divisors (1114636).

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

690804 is a wasteful number, since it uses less digits than its factorization.

690804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 690804 is about 831.1461965262. The cubic root of 690804 is about 88.3998675974.

The spelling of 690804 in words is "six hundred ninety thousand, eight hundred four".