28089515 has 4 divisors (see below), whose sum is σ = 33707424. Its totient is φ = 22471608.

The previous prime is 28089497. The next prime is 28089527. The reversal of 28089515 is 51598082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51598082 = 2 ⋅25799041.

It is a cyclic number.

It is not a de Polignac number, because 28089515 - 2¹⁰ = 28088491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808947 + ... + 2808956.

It is an arithmetic number, because the mean of its divisors is an integer number (8426856).

Almost surely, 2^28089515 is an apocalyptic number.

28089515 is a deficient number, since it is larger than the sum of its proper divisors (5617909).

28089515 is an equidigital number, since it uses as much as digits as its factorization.

28089515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617908.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 28089515 is about 5299.9542450855. The cubic root of 28089515 is about 303.9821485074.

The spelling of 28089515 in words is "twenty-eight million, eighty-nine thousand, five hundred fifteen".