28667223 has 64 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 16308864.

The previous prime is 28667213. The next prime is 28667231. The reversal of 28667223 is 32276682.

It is not a de Polignac number, because 28667223 - 2⁴ = 28667207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 427836 + ... + 427902.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^28667223 is an apocalyptic number.

28667223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28667223 is a deficient number, since it is larger than the sum of its proper divisors (20684457).

28667223 is a wasteful number, since it uses less digits than its factorization.

28667223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 159 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28667223 is about 5354.1780881850. The cubic root of 28667223 is about 306.0519903972.

The spelling of 28667223 in words is "twenty-eight million, six hundred sixty-seven thousand, two hundred twenty-three".