28437889 has 12 divisors (see below), whose sum is σ = 31805200. Its totient is φ = 25351488.

The previous prime is 28437869. The next prime is 28437901. The reversal of 28437889 is 98873482.

It is not a de Polignac number, because 28437889 - 2¹⁵ = 28405121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28437869) 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, 2902 + ... + 8080.

Almost surely, 2^28437889 is an apocalyptic number.

It is an amenable number.

28437889 is a deficient number, since it is larger than the sum of its proper divisors (3367311).

28437889 is a wasteful number, since it uses less digits than its factorization.

28437889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232 (or 5215 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 28437889 is about 5332.7187250032. The cubic root of 28437889 is about 305.2336792001.

The spelling of 28437889 in words is "twenty-eight million, four hundred thirty-seven thousand, eight hundred eighty-nine".