561803990 has 16 divisors (see below), whose sum is σ = 1103178960. Its totient is φ = 204292320.

The previous prime is 561803971. The next prime is 561804007. The reversal of 561803990 is 99308165.

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, 2553545 + ... + 2553764.

It is an arithmetic number, because the mean of its divisors is an integer number (68948685).

Almost surely, 2^561803990 is an apocalyptic number.

561803990 is a deficient number, since it is larger than the sum of its proper divisors (541374970).

561803990 is a wasteful number, since it uses less digits than its factorization.

561803990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107327.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 561803990 is about 23702.4047303222. The cubic root of 561803990 is about 825.1412014208.

The spelling of 561803990 in words is "five hundred sixty-one million, eight hundred three thousand, nine hundred ninety".