990810240 has 128 divisors (see below), whose sum is σ = 3609429120. Its totient is φ = 226467840.

The previous prime is 990810229. The next prime is 990810241. The reversal of 990810240 is 42018099.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (990810241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23421 + ... + 50300.

It is an arithmetic number, because the mean of its divisors is an integer number (28198665).

Almost surely, 2^990810240 is an apocalyptic number.

It is an amenable number.

990810240 is an abundant number, since it is smaller than the sum of its proper divisors (2618618880).

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

990810240 is a wasteful number, since it uses less digits than its factorization.

990810240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73750 (or 73738 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 990810240 is about 31477.1383705698. The cubic root of 990810240 is about 996.9273149434.

The spelling of 990810240 in words is "nine hundred ninety million, eight hundred ten thousand, two hundred forty".