28089581 has 8 divisors (see below), whose sum is σ = 31842720. Its totient is φ = 24563952.

The previous prime is 28089569. The next prime is 28089613. The reversal of 28089581 is 18598082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28089581 is a prime.

It is a super-2 number, since 2×28089581² = 1578049121511122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28089181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56615 + ... + 57108.

It is an arithmetic number, because the mean of its divisors is an integer number (3980340).

Almost surely, 2^28089581 is an apocalyptic number.

It is an amenable number.

28089581 is a deficient number, since it is larger than the sum of its proper divisors (3753139).

28089581 is a wasteful number, since it uses less digits than its factorization.

28089581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113755.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 28089581 is about 5299.9604715507. The cubic root of 28089581 is about 303.9823865892.

The spelling of 28089581 in words is "twenty-eight million, eighty-nine thousand, five hundred eighty-one".