561828988 has 24 divisors (see below), whose sum is σ = 1189756512. Its totient is φ = 226619904.

The previous prime is 561828973. The next prime is 561828989. The reversal of 561828988 is 889828165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561828989) 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, 589681 + ... + 590632.

It is an arithmetic number, because the mean of its divisors is an integer number (49573188).

Almost surely, 2^561828988 is an apocalyptic number.

It is an amenable number.

561828988 is an abundant number, since it is smaller than the sum of its proper divisors (627927524).

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

561828988 is a wasteful number, since it uses less digits than its factorization.

561828988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180341 (or 1180339 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 55.

The square root of 561828988 is about 23702.9320549168. The cubic root of 561828988 is about 825.1534397187.

The spelling of 561828988 in words is "five hundred sixty-one million, eight hundred twenty-eight thousand, nine hundred eighty-eight".