990328281 has 8 divisors (see below), whose sum is σ = 1325699424. Its totient is φ = 657588000.

The previous prime is 990328253. The next prime is 990328291. The reversal of 990328281 is 182823099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990328281 - 2⁷ = 990328153 is a prime.

It is a super-2 number, since 2×990328281² = 1961500208296829922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990328231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656836 + ... + 658341.

It is an arithmetic number, because the mean of its divisors is an integer number (165712428).

Almost surely, 2^990328281 is an apocalyptic number.

It is an amenable number.

990328281 is a deficient number, since it is larger than the sum of its proper divisors (335371143).

990328281 is a wasteful number, since it uses less digits than its factorization.

990328281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315431.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 990328281 is about 31469.4817402511. The cubic root of 990328281 is about 996.7656438855.

The spelling of 990328281 in words is "nine hundred ninety million, three hundred twenty-eight thousand, two hundred eighty-one".