28208223 has 8 divisors (see below), whose sum is σ = 41790000. Its totient is φ = 18805464.

The previous prime is 28208207. The next prime is 28208227. The reversal of 28208223 is 32280282.

It is not a de Polignac number, because 28208223 - 2⁴ = 28208207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1044749 = 28208223 / (2 + 8 + 2 + 0 + 8 + 2 + 2 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28208227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522348 + ... + 522401.

It is an arithmetic number, because the mean of its divisors is an integer number (5223750).

Almost surely, 2^28208223 is an apocalyptic number.

28208223 is a deficient number, since it is larger than the sum of its proper divisors (13581777).

28208223 is a wasteful number, since it uses less digits than its factorization.

28208223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044758 (or 1044752 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28208223 is about 5311.1414027495. The cubic root of 28208223 is about 304.4097623847.

It can be divided in two parts, 2 and 8208223, that added together give a square (8208225 = 2865²).

The spelling of 28208223 in words is "twenty-eight million, two hundred eight thousand, two hundred twenty-three".