305506566 has 40 divisors (see below), whose sum is σ = 692839224. Its totient is φ = 100604160.

The previous prime is 305506559. The next prime is 305506577. The reversal of 305506566 is 665605503.

It is a happy number.

It is a super-2 number, since 2×305506566² = 186668523738224712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 305506566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2086 + ... + 24806.

Almost surely, 2^305506566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 305506566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346419612).

305506566 is an abundant number, since it is smaller than the sum of its proper divisors (387332658).

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

305506566 is a wasteful number, since it uses less digits than its factorization.

305506566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22818 (or 22809 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 305506566 is about 17478.7461220764. The cubic root of 305506566 is about 673.5040054127.

The spelling of 305506566 in words is "three hundred five million, five hundred six thousand, five hundred sixty-six".