550989900 has 108 divisors (see below), whose sum is σ = 1731529800. Its totient is φ = 146549760.

The previous prime is 550989899. The next prime is 550989913. The reversal of 550989900 is 9989055.

550989900 is a `hidden beast` number, since 550 + 9 + 8 + 9 + 90 + 0 = 666.

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

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 35 ways as a sum of consecutive naturals, for example, 592636 + ... + 593564.

Almost surely, 2^550989900 is an apocalyptic number.

550989900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550989900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (865764900).

550989900 is an abundant number, since it is smaller than the sum of its proper divisors (1180539900).

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

550989900 is a wasteful number, since it uses less digits than its factorization.

550989900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 1598 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 550989900 is about 23473.1740503921. The cubic root of 550989900 is about 819.8125191056.

The spelling of 550989900 in words is "five hundred fifty million, nine hundred eighty-nine thousand, nine hundred".