28667205 has 36 divisors (see below), whose sum is σ = 57806892. Its totient is φ = 13104000.

The previous prime is 28667203. The next prime is 28667207. The reversal of 28667205 is 50276682.

It is an interprime number because it is at equal distance from previous prime (28667203) and next prime (28667207).

It can be written as a sum of positive squares in 2 ways, for example, as 3896676 + 24770529 = 1974^2 + 4977^2 .

It is not a de Polignac number, because 28667205 - 2¹ = 28667203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28667205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28667201) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4296 + ... + 8705.

It is an arithmetic number, because the mean of its divisors is an integer number (1605747).

Almost surely, 2^28667205 is an apocalyptic number.

It is an amenable number.

28667205 is an abundant number, since it is smaller than the sum of its proper divisors (29139687).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28667205 is a wasteful number, since it uses less digits than its factorization.

28667205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13026 (or 13016 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 28667205 is about 5354.1764072544. The cubic root of 28667205 is about 306.0519263411.

The spelling of 28667205 in words is "twenty-eight million, six hundred sixty-seven thousand, two hundred five".