28702189 has 2 divisors, whose sum is σ = 28702190. Its totient is φ = 28702188.

The previous prime is 28702169. The next prime is 28702241. The reversal of 28702189 is 98120782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27910089 + 792100 = 5283^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 28702189 - 2⁷ = 28702061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28702139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14351094 + 14351095.

It is an arithmetic number, because the mean of its divisors is an integer number (14351095).

Almost surely, 2^28702189 is an apocalyptic number.

It is an amenable number.

28702189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28702189 is an equidigital number, since it uses as much as digits as its factorization.

28702189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28702189 is about 5357.4423935307. The cubic root of 28702189 is about 306.1763724709.

The spelling of 28702189 in words is "twenty-eight million, seven hundred two thousand, one hundred eighty-nine".