561623800 has 24 divisors (see below), whose sum is σ = 1305775800. Its totient is φ = 224649440.

The previous prime is 561623779. The next prime is 561623819. The reversal of 561623800 is 8326165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1403860 + ... + 1404259.

It is an arithmetic number, because the mean of its divisors is an integer number (54407325).

Almost surely, 2^561623800 is an apocalyptic number.

561623800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561623800 is an abundant number, since it is smaller than the sum of its proper divisors (744152000).

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

561623800 is a wasteful number, since it uses less digits than its factorization.

561623800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808135 (or 2808126 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 561623800 is about 23698.6033343739. The cubic root of 561623800 is about 825.0529748658.

Adding to 561623800 its reverse (8326165), we get a palindrome (569949965).

The spelling of 561623800 in words is "five hundred sixty-one million, six hundred twenty-three thousand, eight hundred".