550915890 has 32 divisors (see below), whose sum is σ = 1511084160. Its totient is φ = 125923584.

The previous prime is 550915877. The next prime is 550915907. The reversal of 550915890 is 98519055.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1311495 + ... + 1311914.

It is an arithmetic number, because the mean of its divisors is an integer number (47221380).

Almost surely, 2^550915890 is an apocalyptic number.

550915890 is an abundant number, since it is smaller than the sum of its proper divisors (960168270).

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

550915890 is a wasteful number, since it uses less digits than its factorization.

550915890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623426.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 550915890 is about 23471.5975169991. The cubic root of 550915890 is about 819.7758112087.

The spelling of 550915890 in words is "five hundred fifty million, nine hundred fifteen thousand, eight hundred ninety".