28985389 has 4 divisors (see below), whose sum is σ = 29251420. Its totient is φ = 28719360.

The previous prime is 28985387. The next prime is 28985399. The reversal of 28985389 is 98358982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15721225 + 13264164 = 3965^2 + 3642^2 .

It is a cyclic number.

It is not a de Polignac number, because 28985389 - 2¹ = 28985387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28985387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132852 + ... + 133069.

It is an arithmetic number, because the mean of its divisors is an integer number (7312855).

Almost surely, 2^28985389 is an apocalyptic number.

It is an amenable number.

28985389 is a deficient number, since it is larger than the sum of its proper divisors (266031).

28985389 is a wasteful number, since it uses less digits than its factorization.

28985389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266030.

The product of its digits is 1244160, while the sum is 52.

The square root of 28985389 is about 5383.8080389256. The cubic root of 28985389 is about 307.1800766351.

The spelling of 28985389 in words is "twenty-eight million, nine hundred eighty-five thousand, three hundred eighty-nine".