990928665 has 24 divisors (see below), whose sum is σ = 1792290240. Its totient is φ = 505516704.

The previous prime is 990928663. The next prime is 990928667. The reversal of 990928665 is 566829099.

990928665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (990928663) and next prime (990928667).

It is not a de Polignac number, because 990928665 - 2¹ = 990928663 is a prime.

It is a super-4 number, since 4×990928665⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (990928663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 477675 + ... + 479744.

It is an arithmetic number, because the mean of its divisors is an integer number (74678760).

Almost surely, 2^990928665 is an apocalyptic number.

It is an amenable number.

990928665 is a deficient number, since it is larger than the sum of its proper divisors (801361575).

990928665 is a wasteful number, since it uses less digits than its factorization.

990928665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957453 (or 957450 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 990928665 is about 31479.0194415264. The cubic root of 990928665 is about 996.9670320722.

The spelling of 990928665 in words is "nine hundred ninety million, nine hundred twenty-eight thousand, six hundred sixty-five".