28601 has 4 divisors (see below), whose sum is σ = 29412. Its totient is φ = 27792.

The previous prime is 28597. The next prime is 28603. The reversal of 28601 is 10682.

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 13225 + 15376 = 115^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 28601 - 2² = 28597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 423.

It is an arithmetic number, because the mean of its divisors is an integer number (7353).

2²⁸⁶⁰¹ is an apocalyptic number.

It is an amenable number.

28601 is a deficient number, since it is larger than the sum of its proper divisors (811).

28601 is an equidigital number, since it uses as much as digits as its factorization.

28601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 28601 is about 169.1183017890. The cubic root of 28601 is about 30.5816142561.

The spelling of 28601 in words is "twenty-eight thousand, six hundred one".