28885491 has 30 divisors (see below), whose sum is σ = 45754940. Its totient is φ = 18110304.

The previous prime is 28885471. The next prime is 28885501. The reversal of 28885491 is 19458882.

It is a happy number.

28885491 is a `hidden beast` number, since 2 + 88 + 85 + 491 = 666.

It is not a de Polignac number, because 28885491 - 2⁹ = 28884979 is a prime.

It is a super-2 number, since 2×28885491² = 1668743180622162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28885471) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 210775 + ... + 210911.

Almost surely, 2^28885491 is an apocalyptic number.

28885491 is a deficient number, since it is larger than the sum of its proper divisors (16869449).

28885491 is an equidigital number, since it uses as much as digits as its factorization.

28885491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 159 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28885491 is about 5374.5223973857. The cubic root of 28885491 is about 306.8267722309.

The spelling of 28885491 in words is "twenty-eight million, eight hundred eighty-five thousand, four hundred ninety-one".