561851904 has 80 divisors (see below), whose sum is σ = 1584929808. Its totient is φ = 176259072.

The previous prime is 561851891. The next prime is 561851911. The reversal of 561851904 is 409158165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15354 + ... + 36870.

Almost surely, 2^561851904 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 561851904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792464904).

561851904 is an abundant number, since it is smaller than the sum of its proper divisors (1023077904).

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

561851904 is a wasteful number, since it uses less digits than its factorization.

561851904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555 (or 21539 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 561851904 is about 23703.4154500992. The cubic root of 561851904 is about 825.1646584107.

The spelling of 561851904 in words is "five hundred sixty-one million, eight hundred fifty-one thousand, nine hundred four".