555555990 has 32 divisors (see below), whose sum is σ = 1454547456. Its totient is φ = 134680160.

The previous prime is 555555967. The next prime is 555556021. The reversal of 555555990 is 99555555.

555555990 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 841422 + ... + 842081.

It is an arithmetic number, because the mean of its divisors is an integer number (45454608).

Almost surely, 2^555555990 is an apocalyptic number.

555555990 is an abundant number, since it is smaller than the sum of its proper divisors (898991466).

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

555555990 is a wasteful number, since it uses less digits than its factorization.

555555990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683524.

The product of its (nonzero) digits is 1265625, while the sum is 48.

The square root of 555555990 is about 23570.2352555082. The cubic root of 555555990 is about 822.0709057299.

The spelling of 555555990 in words is "five hundred fifty-five million, five hundred fifty-five thousand, nine hundred ninety".