1028816885 has 4 divisors (see below), whose sum is σ = 1234580268. Its totient is φ = 823053504.

The previous prime is 1028816879. The next prime is 1028816917. The reversal of 1028816885 is 5886188201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5886188201 = 19 ⋅309799379.

It can be written as a sum of positive squares in 2 ways, for example, as 172318129 + 856498756 = 13127^2 + 29266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028816885 is a prime.

It is a super-2 number, since 2×1028816885² = 2116928365722206450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102881684 + ... + 102881693.

It is an arithmetic number, because the mean of its divisors is an integer number (308645067).

Almost surely, 2^1028816885 is an apocalyptic number.

It is an amenable number.

1028816885 is a deficient number, since it is larger than the sum of its proper divisors (205763383).

1028816885 is an equidigital number, since it uses as much as digits as its factorization.

1028816885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205763382.

The product of its (nonzero) digits is 245760, while the sum is 47.

The square root of 1028816885 is about 32075.1755256304. The cubic root of 1028816885 is about 1009.5148096013.

The spelling of 1028816885 in words is "one billion, twenty-eight million, eight hundred sixteen thousand, eight hundred eighty-five".