990661275 has 36 divisors (see below), whose sum is σ = 1776649680. Its totient is φ = 527678400.

The previous prime is 990661261. The next prime is 990661297. The reversal of 990661275 is 572166099.

It is a happy number.

990661275 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990661275 - 2⁶ = 990661211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 990661275.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 209386 + ... + 214064.

It is an arithmetic number, because the mean of its divisors is an integer number (49351380).

Almost surely, 2^990661275 is an apocalyptic number.

990661275 is a deficient number, since it is larger than the sum of its proper divisors (785988405).

990661275 is a wasteful number, since it uses less digits than its factorization.

990661275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636 (or 5628 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 990661275 is about 31474.7720404771. The cubic root of 990661275 is about 996.8773508787.

The spelling of 990661275 in words is "nine hundred ninety million, six hundred sixty-one thousand, two hundred seventy-five".