565561764 has 30 divisors (see below), whose sum is σ = 1478491014. Its totient is φ = 188520480.

The previous prime is 565561753. The next prime is 565561811. The reversal of 565561764 is 467165565.

It can be written as a sum of positive squares in only one way, i.e., 501401664 + 64160100 = 22392^2 + 8010^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 872457 + ... + 873104.

Almost surely, 2^565561764 is an apocalyptic number.

565561764 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

565561764 is an abundant number, since it is smaller than the sum of its proper divisors (912929250).

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

565561764 is a wasteful number, since it uses less digits than its factorization.

565561764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745577 (or 1745566 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 565561764 is about 23781.5425067425. The cubic root of 565561764 is about 826.9768395400.

The spelling of 565561764 in words is "five hundred sixty-five million, five hundred sixty-one thousand, seven hundred sixty-four".