990888065 has 4 divisors (see below), whose sum is σ = 1189065684. Its totient is φ = 792710448.

The previous prime is 990888023. The next prime is 990888071. The reversal of 990888065 is 560888099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214095424 + 776792641 = 14632^2 + 27871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990888065 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990887998 and 990888016.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 99088802 + ... + 99088811.

It is an arithmetic number, because the mean of its divisors is an integer number (297266421).

Almost surely, 2^990888065 is an apocalyptic number.

It is an amenable number.

990888065 is a deficient number, since it is larger than the sum of its proper divisors (198177619).

990888065 is a wasteful number, since it uses less digits than its factorization.

990888065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198177618.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The square root of 990888065 is about 31478.3745609585. The cubic root of 990888065 is about 996.9534160856.

The spelling of 990888065 in words is "nine hundred ninety million, eight hundred eighty-eight thousand, sixty-five".