561591976 has 48 divisors (see below), whose sum is σ = 1169540820. Its totient is φ = 252595200.

The previous prime is 561591971. The next prime is 561592007. The reversal of 561591976 is 679195165.

It can be written as a sum of positive squares in 2 ways, for example, as 500595876 + 60996100 = 22374^2 + 7810^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (561591971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90906 + ... + 96886.

Almost surely, 2^561591976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561591976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584770410).

561591976 is an abundant number, since it is smaller than the sum of its proper divisors (607948844).

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

561591976 is a wasteful number, since it uses less digits than its factorization.

561591976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106 (or 6091 counting only the distinct ones).

The product of its digits is 510300, while the sum is 49.

The square root of 561591976 is about 23697.9318928889. The cubic root of 561591976 is about 825.0373908979.

The spelling of 561591976 in words is "five hundred sixty-one million, five hundred ninety-one thousand, nine hundred seventy-six".