556290990 has 80 divisors (see below), whose sum is σ = 1499509440. Its totient is φ = 147977280.

The previous prime is 556290971. The next prime is 556291003. The reversal of 556290990 is 99092655.

556290990 is a `hidden beast` number, since 556 + 2 + 9 + 0 + 9 + 90 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 534891 + ... + 535929.

It is an arithmetic number, because the mean of its divisors is an integer number (18743868).

Almost surely, 2^556290990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556290990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749754720).

556290990 is an abundant number, since it is smaller than the sum of its proper divisors (943218450).

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

556290990 is a wasteful number, since it uses less digits than its factorization.

556290990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719 (or 1710 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 556290990 is about 23585.8218003953. The cubic root of 556290990 is about 822.4332789563.

The spelling of 556290990 in words is "five hundred fifty-six million, two hundred ninety thousand, nine hundred ninety".