549999990 has 32 divisors (see below), whose sum is σ = 1466667360. Its totient is φ = 146666592.

The previous prime is 549999959. The next prime is 550000001. The reversal of 549999990 is 99999945.

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, 1018249 + ... + 1018788.

It is an arithmetic number, because the mean of its divisors is an integer number (45833355).

Almost surely, 2^549999990 is an apocalyptic number.

549999990 is an abundant number, since it is smaller than the sum of its proper divisors (916667370).

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

549999990 is a wasteful number, since it uses less digits than its factorization.

549999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037053 (or 2037047 counting only the distinct ones).

The product of its (nonzero) digits is 10628820, while the sum is 63.

The square root of 549999990 is about 23452.0785859164. The cubic root of 549999990 is about 819.3212656351.

The spelling of 549999990 in words is "five hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety".