609204856 has 64 divisors (see below), whose sum is σ = 1290441600. Its totient is φ = 267660288.

The previous prime is 609204853. The next prime is 609204857. The reversal of 609204856 is 658402906.

It is a happy number.

It is a super-2 number, since 2×609204856² = 742261113147961472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609204853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218785 + ... + 221551.

It is an arithmetic number, because the mean of its divisors is an integer number (20163150).

Almost surely, 2^609204856 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 609204856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645220800).

609204856 is an abundant number, since it is smaller than the sum of its proper divisors (681236744).

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

609204856 is a wasteful number, since it uses less digits than its factorization.

609204856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 609204856 is about 24682.0756015372. The cubic root of 609204856 is about 847.7239482080.

The spelling of 609204856 in words is "six hundred nine million, two hundred four thousand, eight hundred fifty-six".