1028090665 has 32 divisors (see below), whose sum is σ = 1532067840. Its totient is φ = 646315200.

The previous prime is 1028090647. The next prime is 1028090669. The reversal of 1028090665 is 5660908201.

It is not a de Polignac number, because 1028090665 - 2¹⁵ = 1028057897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1028090669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4321 + ... + 45550.

It is an arithmetic number, because the mean of its divisors is an integer number (47877120).

Almost surely, 2^1028090665 is an apocalyptic number.

It is an amenable number.

1028090665 is a deficient number, since it is larger than the sum of its proper divisors (503977175).

1028090665 is a wasteful number, since it uses less digits than its factorization.

1028090665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49933.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1028090665 is about 32063.8529344182. The cubic root of 1028090665 is about 1009.2772219982.

Adding to 1028090665 its reverse (5660908201), we get a palindrome (6688998866).

The spelling of 1028090665 in words is "one billion, twenty-eight million, ninety thousand, six hundred sixty-five".