28667615 has 4 divisors (see below), whose sum is σ = 34401144. Its totient is φ = 22934088.

The previous prime is 28667609. The next prime is 28667623. The reversal of 28667615 is 51676682.

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 28667615 - 2¹⁰ = 28666591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866757 + ... + 2866766.

It is an arithmetic number, because the mean of its divisors is an integer number (8600286).

Almost surely, 2^28667615 is an apocalyptic number.

28667615 is a deficient number, since it is larger than the sum of its proper divisors (5733529).

28667615 is an equidigital number, since it uses as much as digits as its factorization.

28667615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733528.

The product of its digits is 120960, while the sum is 41.

The square root of 28667615 is about 5354.2146949856. The cubic root of 28667615 is about 306.0533853915.

The spelling of 28667615 in words is "twenty-eight million, six hundred sixty-seven thousand, six hundred fifteen".