28515227 has 4 divisors (see below), whose sum is σ = 30708720. Its totient is φ = 26321736.

The previous prime is 28515217. The next prime is 28515247. The reversal of 28515227 is 72251582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28515227 - 2¹⁸ = 28253083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28515193 and 28515202.

It is not an unprimeable number, because it can be changed into a prime (28515217) 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, 1096727 + ... + 1096752.

It is an arithmetic number, because the mean of its divisors is an integer number (7677180).

Almost surely, 2^28515227 is an apocalyptic number.

28515227 is a deficient number, since it is larger than the sum of its proper divisors (2193493).

28515227 is a wasteful number, since it uses less digits than its factorization.

28515227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193492.

The product of its digits is 11200, while the sum is 32.

The square root of 28515227 is about 5339.9650747922. The cubic root of 28515227 is about 305.5101272310.

The spelling of 28515227 in words is "twenty-eight million, five hundred fifteen thousand, two hundred twenty-seven".