990807040 has 88 divisors (see below), whose sum is σ = 2459102040. Its totient is φ = 382599168.

The previous prime is 990807031. The next prime is 990807049. The reversal of 990807040 is 40708099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990807031) and next prime (990807049).

It can be written as a sum of positive squares in 4 ways, for example, as 1327104 + 989479936 = 1152^2 + 31456^2 .

It is not an unprimeable number, because it can be changed into a prime (990807049) 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, 145144 + ... + 151816.

Almost surely, 2^990807040 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 990807040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229551020).

990807040 is an abundant number, since it is smaller than the sum of its proper divisors (1468295000).

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

990807040 is a wasteful number, since it uses less digits than its factorization.

990807040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6727 (or 6709 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 990807040 is about 31477.0875399869. The cubic root of 990807040 is about 996.9262416901.

The spelling of 990807040 in words is "nine hundred ninety million, eight hundred seven thousand, forty".