990900428 has 48 divisors (see below), whose sum is σ = 2039541504. Its totient is φ = 412413120.

The previous prime is 990900419. The next prime is 990900431. The reversal of 990900428 is 824009099.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 215651 + ... + 220197.

It is an arithmetic number, because the mean of its divisors is an integer number (42490448).

Almost surely, 2^990900428 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 990900428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019770752).

990900428 is an abundant number, since it is smaller than the sum of its proper divisors (1048641076).

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

990900428 is a wasteful number, since it uses less digits than its factorization.

990900428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782 (or 4780 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 990900428 is about 31478.5709332555. The cubic root of 990900428 is about 996.9575622935.

The spelling of 990900428 in words is "nine hundred ninety million, nine hundred thousand, four hundred twenty-eight".