28889215 has 16 divisors (see below), whose sum is σ = 37386720. Its totient is φ = 21358080.

The previous prime is 28889213. The next prime is 28889227. The reversal of 28889215 is 51298882.

It is not a de Polignac number, because 28889215 - 2¹ = 28889213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28889213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2336670).

Almost surely, 2^28889215 is an apocalyptic number.

28889215 is a deficient number, since it is larger than the sum of its proper divisors (8497505).

28889215 is a wasteful number, since it uses less digits than its factorization.

28889215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482.

The product of its digits is 92160, while the sum is 43.

The square root of 28889215 is about 5374.8688356089. The cubic root of 28889215 is about 306.8399573255.

The spelling of 28889215 in words is "twenty-eight million, eight hundred eighty-nine thousand, two hundred fifteen".