609991204 has 27 divisors (see below), whose sum is σ = 1092695443. Its totient is φ = 297956672.

The previous prime is 609991201. The next prime is 609991223. The reversal of 609991204 is 402199906.

The square root of 609991204 is 24698.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4831204 + 605160000 = 2198^2 + 24600^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609991201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2617872 + ... + 2618104.

Almost surely, 2^609991204 is an apocalyptic number.

609991204 is the 24698-th square number.

It is an amenable number.

609991204 is a deficient number, since it is larger than the sum of its proper divisors (482704239).

609991204 is an equidigital number, since it uses as much as digits as its factorization.

609991204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The cubic root of 609991204 is about 848.0885324234.

The spelling of 609991204 in words is "six hundred nine million, nine hundred ninety-one thousand, two hundred four".