28133615 has 8 divisors (see below), whose sum is σ = 33976320. Its totient is φ = 22362912.

The previous prime is 28133603. The next prime is 28133621. The reversal of 28133615 is 51633182.

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 28133615 - 2¹⁴ = 28117231 is a prime.

It is a congruent number.

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, 17135 + ... + 18704.

It is an arithmetic number, because the mean of its divisors is an integer number (4247040).

Almost surely, 2^28133615 is an apocalyptic number.

28133615 is a deficient number, since it is larger than the sum of its proper divisors (5842705).

28133615 is a wasteful number, since it uses less digits than its factorization.

28133615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36001.

The product of its digits is 4320, while the sum is 29.

The square root of 28133615 is about 5304.1130266992. The cubic root of 28133615 is about 304.1411473763.

Adding to 28133615 its reverse (51633182), we get a palindrome (79766797).

The spelling of 28133615 in words is "twenty-eight million, one hundred thirty-three thousand, six hundred fifteen".