561694872 has 32 divisors (see below), whose sum is σ = 1478145600. Its totient is φ = 177377184.

The previous prime is 561694849. The next prime is 561694877. The reversal of 561694872 is 278496165.

It is a super-2 number, since 2×561694872² = 631002258462192768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561694877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615438 + ... + 616349.

It is an arithmetic number, because the mean of its divisors is an integer number (46192050).

Almost surely, 2^561694872 is an apocalyptic number.

It is an amenable number.

561694872 is an abundant number, since it is smaller than the sum of its proper divisors (916450728).

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

561694872 is a wasteful number, since it uses less digits than its factorization.

561694872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231815 (or 1231811 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 561694872 is about 23700.1027845872. The cubic root of 561694872 is about 825.0877761520.

The spelling of 561694872 in words is "five hundred sixty-one million, six hundred ninety-four thousand, eight hundred seventy-two".