561009280 has 64 divisors (see below), whose sum is σ = 1444350600. Its totient is φ = 207138816.

The previous prime is 561009277. The next prime is 561009283. The reversal of 561009280 is 82900165.

It is an interprime number because it is at equal distance from previous prime (561009277) and next prime (561009283).

It can be written as a sum of positive squares in 4 ways, for example, as 155550784 + 405458496 = 12472^2 + 20136^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×561009280² = 629462824492236800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561009283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25395 + ... + 42034.

Almost surely, 2^561009280 is an apocalyptic number.

It is an amenable number.

561009280 is an abundant number, since it is smaller than the sum of its proper divisors (883341320).

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

561009280 is a wasteful number, since it uses less digits than its factorization.

561009280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67461 (or 67449 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 561009280 is about 23685.6344647974. The cubic root of 561009280 is about 824.7519450139.

The spelling of 561009280 in words is "five hundred sixty-one million, nine thousand, two hundred eighty".