28870223 has 4 divisors (see below), whose sum is σ = 29021568. Its totient is φ = 28718880.

The previous prime is 28870217. The next prime is 28870229. The reversal of 28870223 is 32207882.

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

It is an interprime number because it is at equal distance from previous prime (28870217) and next prime (28870229).

It is a cyclic number.

It is not a de Polignac number, because 28870223 - 2⁶ = 28870159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28870223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75386 + ... + 75767.

It is an arithmetic number, because the mean of its divisors is an integer number (7255392).

Almost surely, 2^28870223 is an apocalyptic number.

28870223 is a deficient number, since it is larger than the sum of its proper divisors (151345).

28870223 is a wasteful number, since it uses less digits than its factorization.

28870223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151344.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28870223 is about 5373.1018043584. The cubic root of 28870223 is about 306.7727029084.

The spelling of 28870223 in words is "twenty-eight million, eight hundred seventy thousand, two hundred twenty-three".