561621200 has 60 divisors (see below), whose sum is σ = 1542059040. Its totient is φ = 192554880.

The previous prime is 561621169. The next prime is 561621257. The reversal of 561621200 is 2126165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97490 + ... + 103089.

It is an arithmetic number, because the mean of its divisors is an integer number (25700984).

Almost surely, 2^561621200 is an apocalyptic number.

561621200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561621200 is an abundant number, since it is smaller than the sum of its proper divisors (980437840).

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

561621200 is a wasteful number, since it uses less digits than its factorization.

561621200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200604 (or 200593 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 561621200 is about 23698.5484787571. The cubic root of 561621200 is about 825.0517016879.

Adding to 561621200 its reverse (2126165), we get a palindrome (563747365).

It can be divided in two parts, 561 and 621200, that multiplied together give a triangular number (348493200 = T₂₆₄₀₀).

The spelling of 561621200 in words is "five hundred sixty-one million, six hundred twenty-one thousand, two hundred".