561933990 has 32 divisors (see below), whose sum is σ = 1498491360. Its totient is φ = 149848992.

The previous prime is 561933989. The next prime is 561934007. The reversal of 561933990 is 99339165.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040349 + ... + 1040888.

It is an arithmetic number, because the mean of its divisors is an integer number (46827855).

Almost surely, 2^561933990 is an apocalyptic number.

561933990 is an abundant number, since it is smaller than the sum of its proper divisors (936557370).

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

561933990 is a wasteful number, since it uses less digits than its factorization.

561933990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081253 (or 2081247 counting only the distinct ones).

The product of its (nonzero) digits is 196830, while the sum is 45.

The square root of 561933990 is about 23705.1469094794. The cubic root of 561933990 is about 825.2048416970.

The spelling of 561933990 in words is "five hundred sixty-one million, nine hundred thirty-three thousand, nine hundred ninety".