28667005 has 4 divisors (see below), whose sum is σ = 34400412. Its totient is φ = 22933600.

The previous prime is 28666987. The next prime is 28667017. The reversal of 28667005 is 50076682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5885476 + 22781529 = 2426^2 + 4773^2 .

It is not a de Polignac number, because 28667005 - 2¹³ = 28658813 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, 2866696 + ... + 2866705.

It is an arithmetic number, because the mean of its divisors is an integer number (8600103).

Almost surely, 2^28667005 is an apocalyptic number.

It is an amenable number.

28667005 is a deficient number, since it is larger than the sum of its proper divisors (5733407).

28667005 is an equidigital number, since it uses as much as digits as its factorization.

28667005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733406.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 28667005 is about 5354.1577302130. The cubic root of 28667005 is about 306.0512146041.

The spelling of 28667005 in words is "twenty-eight million, six hundred sixty-seven thousand, five".