561699924 has 48 divisors (see below), whose sum is σ = 1400753088. Its totient is φ = 174565888.

The previous prime is 561699893. The next prime is 561699949. The reversal of 561699924 is 429996165.

561699924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8962 + ... + 34694.

It is an arithmetic number, because the mean of its divisors is an integer number (29182356).

Almost surely, 2^561699924 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 561699924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700376544).

561699924 is an abundant number, since it is smaller than the sum of its proper divisors (839053164).

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

561699924 is a wasteful number, since it uses less digits than its factorization.

561699924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25864 (or 25862 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 561699924 is about 23700.2093661638. The cubic root of 561699924 is about 825.0902498147.

The spelling of 561699924 in words is "five hundred sixty-one million, six hundred ninety-nine thousand, nine hundred twenty-four".