561350864 has 20 divisors (see below), whose sum is σ = 1090289220. Its totient is φ = 279985920.

The previous prime is 561350849. The next prime is 561350873. The reversal of 561350864 is 468053165.

It can be written as a sum of positive squares in 2 ways, for example, as 515653264 + 45697600 = 22708^2 + 6760^2 .

It is a super-2 number, since 2×561350864² = 630229585027092992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36347 + ... + 49434.

It is an arithmetic number, because the mean of its divisors is an integer number (54514461).

Almost surely, 2^561350864 is an apocalyptic number.

It is an amenable number.

561350864 is a deficient number, since it is larger than the sum of its proper divisors (528938356).

561350864 is a wasteful number, since it uses less digits than its factorization.

561350864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86198 (or 86192 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 561350864 is about 23692.8441517687. The cubic root of 561350864 is about 824.9193010750.

The spelling of 561350864 in words is "five hundred sixty-one million, three hundred fifty thousand, eight hundred sixty-four".