690409804 has 72 divisors (see below), whose sum is σ = 1460659200. Its totient is φ = 284407200.

The previous prime is 690409793. The next prime is 690409807. The reversal of 690409804 is 408904096.

It is not an unprimeable number, because it can be changed into a prime (690409807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1208839 + ... + 1209409.

Almost surely, 2^690409804 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 690409804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730329600).

690409804 is an abundant number, since it is smaller than the sum of its proper divisors (770249396).

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

690409804 is a wasteful number, since it uses less digits than its factorization.

690409804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 690409804 is about 26275.6504010843. The cubic root of 690409804 is about 883.8304975200.

The spelling of 690409804 in words is "six hundred ninety million, four hundred nine thousand, eight hundred four".