28136959 has 4 divisors (see below), whose sum is σ = 28157416. Its totient is φ = 28116504.

The previous prime is 28136951. The next prime is 28136971. The reversal of 28136959 is 95963182.

It is a happy number.

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 28136959 - 2³ = 28136951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28136951) 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, 8004 + ... + 10969.

It is an arithmetic number, because the mean of its divisors is an integer number (7039354).

Almost surely, 2^28136959 is an apocalyptic number.

28136959 is a deficient number, since it is larger than the sum of its proper divisors (20457).

28136959 is a wasteful number, since it uses less digits than its factorization.

28136959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20456.

The product of its digits is 116640, while the sum is 43.

The square root of 28136959 is about 5304.4282444011. The cubic root of 28136959 is about 304.1531971100.

The spelling of 28136959 in words is "twenty-eight million, one hundred thirty-six thousand, nine hundred fifty-nine".