28987223 has 4 divisors (see below), whose sum is σ = 29006808. Its totient is φ = 28967640.

The previous prime is 28987207. The next prime is 28987253. The reversal of 28987223 is 32278982.

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 28987223 - 2⁴ = 28987207 is a prime.

It is a super-3 number, since 3×28987223³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987253) 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, 7373 + ... + 10598.

It is an arithmetic number, because the mean of its divisors is an integer number (7251702).

Almost surely, 2^28987223 is an apocalyptic number.

28987223 is a deficient number, since it is larger than the sum of its proper divisors (19585).

28987223 is a wasteful number, since it uses less digits than its factorization.

28987223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19584.

The product of its digits is 96768, while the sum is 41.

The square root of 28987223 is about 5383.9783617693. The cubic root of 28987223 is about 307.1865552599.

The spelling of 28987223 in words is "twenty-eight million, nine hundred eighty-seven thousand, two hundred twenty-three".