555990 has 32 divisors (see below), whose sum is σ = 1368576. Its totient is φ = 144480.

The previous prime is 555967. The next prime is 556007. The reversal of 555990 is 99555.

It is a congruent number.

It is an unprimeable number.

555990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1075 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (42768).

2⁵⁵⁵⁹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 555990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684288).

555990 is an abundant number, since it is smaller than the sum of its proper divisors (812586).

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

555990 is a wasteful number, since it uses less digits than its factorization.

555990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 10125, while the sum is 33.

The square root of 555990 is about 745.6473697399. The cubic root of 555990 is about 82.2284922037.

The spelling of 555990 in words is "five hundred fifty-five thousand, nine hundred ninety".