28208371 has 4 divisors (see below), whose sum is σ = 28605744. Its totient is φ = 27811000.

The previous prime is 28208363. The next prime is 28208377. The reversal of 28208371 is 17380282.

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 28208371 - 2³ = 28208363 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28208377) 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, 198580 + ... + 198721.

It is an arithmetic number, because the mean of its divisors is an integer number (7151436).

Almost surely, 2^28208371 is an apocalyptic number.

28208371 is a deficient number, since it is larger than the sum of its proper divisors (397373).

28208371 is an equidigital number, since it uses as much as digits as its factorization.

28208371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397372.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28208371 is about 5311.1553357062. The cubic root of 28208371 is about 304.4102947657.

The spelling of 28208371 in words is "twenty-eight million, two hundred eight thousand, three hundred seventy-one".