28630089 has 12 divisors (see below), whose sum is σ = 41922036. Its totient is φ = 18824832.

The previous prime is 28630061. The next prime is 28630109. The reversal of 28630089 is 98003682.

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 17015625 = 3408^2 + 4125^2 .

It is not a de Polignac number, because 28630089 - 2⁷ = 28629961 is a prime.

It is a super-2 number, since 2×28630089² = 1639363992295842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28632089) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 21132 + ... + 22445.

It is an arithmetic number, because the mean of its divisors is an integer number (3493503).

Almost surely, 2^28630089 is an apocalyptic number.

It is an amenable number.

28630089 is a deficient number, since it is larger than the sum of its proper divisors (13291947).

28630089 is a wasteful number, since it uses less digits than its factorization.

28630089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43656 (or 43653 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28630089 is about 5350.7092053297. The cubic root of 28630089 is about 305.9197854592.

The spelling of 28630089 in words is "twenty-eight million, six hundred thirty thousand, eighty-nine".