28164207 has 4 divisors (see below), whose sum is σ = 37552280. Its totient is φ = 18776136.

The previous prime is 28164197. The next prime is 28164221. The reversal of 28164207 is 70246182.

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

It is not a de Polignac number, because 28164207 - 2⁷ = 28164079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28164247) 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, 4694032 + ... + 4694037.

It is an arithmetic number, because the mean of its divisors is an integer number (9388070).

Almost surely, 2^28164207 is an apocalyptic number.

28164207 is a deficient number, since it is larger than the sum of its proper divisors (9388073).

28164207 is an equidigital number, since it uses as much as digits as its factorization.

28164207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9388072.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28164207 is about 5306.9960429607. The cubic root of 28164207 is about 304.2513466946.

The spelling of 28164207 in words is "twenty-eight million, one hundred sixty-four thousand, two hundred seven".