28727215 has 24 divisors (see below), whose sum is σ = 38342304. Its totient is φ = 20644800.

The previous prime is 28727191. The next prime is 28727233. The reversal of 28727215 is 51272782.

It is not a de Polignac number, because 28727215 - 2⁷ = 28727087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62085 + ... + 62545.

It is an arithmetic number, because the mean of its divisors is an integer number (1597596).

Almost surely, 2^28727215 is an apocalyptic number.

28727215 is a deficient number, since it is larger than the sum of its proper divisors (9615089).

28727215 is a wasteful number, since it uses less digits than its factorization.

28727215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 580 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 28727215 is about 5359.7775140392. Note that the first 3 decimals coincide. The cubic root of 28727215 is about 306.2653336762.

Adding to 28727215 its reverse (51272782), we get a palindrome (79999997).

The spelling of 28727215 in words is "twenty-eight million, seven hundred twenty-seven thousand, two hundred fifteen".