1028890089 has 6 divisors (see below), whose sum is σ = 1486174586. Its totient is φ = 685926720.

The previous prime is 1028890087. The next prime is 1028890091. The reversal of 1028890089 is 9800988201.

It is an interprime number because it is at equal distance from previous prime (1028890087) and next prime (1028890091).

It can be written as a sum of positive squares in only one way, i.e., 530841600 + 498048489 = 23040^2 + 22317^2 .

It is not a de Polignac number, because 1028890089 - 2¹ = 1028890087 is a prime.

It is a super-2 number, since 2×1028890089² = 2117229630484855842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028890087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57160552 + ... + 57160569.

Almost surely, 2^1028890089 is an apocalyptic number.

It is an amenable number.

1028890089 is a deficient number, since it is larger than the sum of its proper divisors (457284497).

1028890089 is a wasteful number, since it uses less digits than its factorization.

1028890089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114321127 (or 114321124 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1028890089 is about 32076.3166370455. The cubic root of 1028890089 is about 1009.5387525628.

The spelling of 1028890089 in words is "one billion, twenty-eight million, eight hundred ninety thousand, eighty-nine".