990087500 has 72 divisors (see below), whose sum is σ = 2189547360. Its totient is φ = 391680000.

The previous prime is 990087481. The next prime is 990087503. The reversal of 990087500 is 5780099.

It is not an unprimeable number, because it can be changed into a prime (990087503) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1287116 + ... + 1287884.

It is an arithmetic number, because the mean of its divisors is an integer number (30410380).

Almost surely, 2^990087500 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 990087500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094773680).

990087500 is an abundant number, since it is smaller than the sum of its proper divisors (1199459860).

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

990087500 is a wasteful number, since it uses less digits than its factorization.

990087500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 990087500 is about 31465.6558806582. The cubic root of 990087500 is about 996.6848552936.

The spelling of 990087500 in words is "nine hundred ninety million, eighty-seven thousand, five hundred".