28698389 has 2 divisors, whose sum is σ = 28698390. Its totient is φ = 28698388.

The previous prime is 28698361. The next prime is 28698407. The reversal of 28698389 is 98389682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 11847364 = 4105^2 + 3442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28698389 - 2²⁰ = 27649813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28698389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28698289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14349194 + 14349195.

It is an arithmetic number, because the mean of its divisors is an integer number (14349195).

Almost surely, 2^28698389 is an apocalyptic number.

It is an amenable number.

28698389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28698389 is an equidigital number, since it uses as much as digits as its factorization.

28698389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The square root of 28698389 is about 5357.0877349545. The cubic root of 28698389 is about 306.1628598945.

The spelling of 28698389 in words is "twenty-eight million, six hundred ninety-eight thousand, three hundred eighty-nine".