28250889 has 32 divisors (see below), whose sum is σ = 41803776. Its totient is φ = 16892160.

The previous prime is 28250881. The next prime is 28250899. The reversal of 28250889 is 98805282.

It is not a de Polignac number, because 28250889 - 2³ = 28250881 is a prime.

It is a super-2 number, since 2×28250889² = 1596225458580642, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28250889.

It is not an unprimeable number, because it can be changed into a prime (28250881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169084 + ... + 169250.

It is an arithmetic number, because the mean of its divisors is an integer number (1306368).

Almost surely, 2^28250889 is an apocalyptic number.

It is an amenable number.

28250889 is a deficient number, since it is larger than the sum of its proper divisors (13552887).

28250889 is a wasteful number, since it uses less digits than its factorization.

28250889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 28250889 is about 5315.1565357946. The cubic root of 28250889 is about 304.5631621477.

The spelling of 28250889 in words is "twenty-eight million, two hundred fifty thousand, eight hundred eighty-nine".