28456 has 8 divisors (see below), whose sum is σ = 53370. Its totient is φ = 14224.

The previous prime is 28447. The next prime is 28463. The reversal of 28456 is 65482.

It can be written as a sum of positive squares in only one way, i.e., 27556 + 900 = 166^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28456.

It is an unprimeable number.

28456 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1771 + ... + 1786.

2²⁸⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

28456 is a deficient number, since it is larger than the sum of its proper divisors (24914).

28456 is a wasteful number, since it uses less digits than its factorization.

28456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563 (or 3559 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 28456 is about 168.6890630717. The cubic root of 28456 is about 30.5298462654.

It can be divided in two parts, 28 and 456, that added together give a palindrome (484).

The spelling of 28456 in words is "twenty-eight thousand, four hundred fifty-six".