28338515 has 4 divisors (see below), whose sum is σ = 34006224. Its totient is φ = 22670808.

The previous prime is 28338511. The next prime is 28338523. The reversal of 28338515 is 51583382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51583382 = 2 ⋅25791691.

It is a cyclic number.

It is not a de Polignac number, because 28338515 - 2² = 28338511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28338511) 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, 2833847 + ... + 2833856.

It is an arithmetic number, because the mean of its divisors is an integer number (8501556).

Almost surely, 2^28338515 is an apocalyptic number.

28338515 is a deficient number, since it is larger than the sum of its proper divisors (5667709).

28338515 is an equidigital number, since it uses as much as digits as its factorization.

28338515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667708.

The product of its digits is 28800, while the sum is 35.

The square root of 28338515 is about 5323.3931848023. The cubic root of 28338515 is about 304.8777257786.

The spelling of 28338515 in words is "twenty-eight million, three hundred thirty-eight thousand, five hundred fifteen".