561945980 has 24 divisors (see below), whose sum is σ = 1181364912. Its totient is φ = 224534912.

The previous prime is 561945893. The next prime is 561945983. The reversal of 561945980 is 89549165.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561945983) 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, 4319 + ... + 33801.

It is an arithmetic number, because the mean of its divisors is an integer number (49223538).

Almost surely, 2^561945980 is an apocalyptic number.

It is an amenable number.

561945980 is an abundant number, since it is smaller than the sum of its proper divisors (619418932).

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

561945980 is a wasteful number, since it uses less digits than its factorization.

561945980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30445 (or 30443 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 561945980 is about 23705.3998067951. The cubic root of 561945980 is about 825.2107107943.

The spelling of 561945980 in words is "five hundred sixty-one million, nine hundred forty-five thousand, nine hundred eighty".