990280 has 32 divisors (see below), whose sum is σ = 2347200. Its totient is φ = 374976.

The previous prime is 990277. The next prime is 990281. The reversal of 990280 is 82099.

It is a happy number.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (73350).

2⁹⁹⁰²⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173600).

990280 is an abundant number, since it is smaller than the sum of its proper divisors (1356920).

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

990280 is a wasteful number, since it uses less digits than its factorization.

990280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 990280 is about 995.1281324533. The cubic root of 990280 is about 99.6749445343.

The spelling of 990280 in words is "nine hundred ninety thousand, two hundred eighty".