565649780 has 12 divisors (see below), whose sum is σ = 1187864580. Its totient is φ = 226259904.

The previous prime is 565649753. The next prime is 565649783. The reversal of 565649780 is 87946565.

It can be written as a sum of positive squares in 2 ways, for example, as 239197156 + 326452624 = 15466^2 + 18068^2 .

It is a super-2 number, since 2×565649780² = 639919347228096800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565649783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14141225 + ... + 14141264.

It is an arithmetic number, because the mean of its divisors is an integer number (98988715).

Almost surely, 2^565649780 is an apocalyptic number.

It is an amenable number.

565649780 is an abundant number, since it is smaller than the sum of its proper divisors (622214800).

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

565649780 is a wasteful number, since it uses less digits than its factorization.

565649780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28282498 (or 28282496 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 565649780 is about 23783.3929454988. The cubic root of 565649780 is about 827.0197369578.

The spelling of 565649780 in words is "five hundred sixty-five million, six hundred forty-nine thousand, seven hundred eighty".