28700289 has 12 divisors (see below), whose sum is σ = 41844816. Its totient is φ = 18954072.

The previous prime is 28700257. The next prime is 28700311. The reversal of 28700289 is 98200782.

It is not a de Polignac number, because 28700289 - 2⁵ = 28700257 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28700209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13939 + ... + 15864.

It is an arithmetic number, because the mean of its divisors is an integer number (3487068).

Almost surely, 2^28700289 is an apocalyptic number.

It is an amenable number.

28700289 is a deficient number, since it is larger than the sum of its proper divisors (13144527).

28700289 is a wasteful number, since it uses less digits than its factorization.

28700289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916 (or 29913 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28700289 is about 5357.2650671775. The cubic root of 28700289 is about 306.1696163318.

The spelling of 28700289 in words is "twenty-eight million, seven hundred thousand, two hundred eighty-nine".