28611 has 18 divisors (see below), whose sum is σ = 47892. Its totient is φ = 16320.

The previous prime is 28607. The next prime is 28619. The reversal of 28611 is 11682.

28611 = 25² + 26² + ... + 46².

It is not a de Polignac number, because 28611 - 2² = 28607 is a prime.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (28619) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1675 + ... + 1691.

2²⁸⁶¹¹ is an apocalyptic number.

28611 is a deficient number, since it is larger than the sum of its proper divisors (19281).

28611 is a wasteful number, since it uses less digits than its factorization.

28611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 31 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 28611 is about 169.1478643081. The cubic root of 28611 is about 30.5851780069.

The spelling of 28611 in words is "twenty-eight thousand, six hundred eleven".