28389115 has 8 divisors (see below), whose sum is σ = 35241840. Its totient is φ = 21928032.

The previous prime is 28389083. The next prime is 28389139. The reversal of 28389115 is 51198382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28389115 - 2⁵ = 28389083 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97749 + ... + 98038.

It is an arithmetic number, because the mean of its divisors is an integer number (4405230).

Almost surely, 2^28389115 is an apocalyptic number.

28389115 is a deficient number, since it is larger than the sum of its proper divisors (6852725).

28389115 is a wasteful number, since it uses less digits than its factorization.

28389115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195821.

The product of its digits is 17280, while the sum is 37.

The square root of 28389115 is about 5328.1436729878. The cubic root of 28389115 is about 305.0590766153.

It can be divided in two parts, 283 and 89115, that added together give a palindrome (89398).

The spelling of 28389115 in words is "twenty-eight million, three hundred eighty-nine thousand, one hundred fifteen".