28426 has 8 divisors (see below), whose sum is σ = 43524. Its totient is φ = 13920.

The previous prime is 28411. The next prime is 28429. The reversal of 28426 is 62482.

It can be written as a sum of positive squares in 2 ways, for example, as 22801 + 5625 = 151^2 + 75^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 28397 and 28406.

It is not an unprimeable number, because it can be changed into a prime (28429) 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, 6 + ... + 238.

2²⁸⁴²⁶ is an apocalyptic number.

28426 is a deficient number, since it is larger than the sum of its proper divisors (15098).

28426 is a wasteful number, since it uses less digits than its factorization.

28426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 768, while the sum is 22.

The square root of 28426 is about 168.6001186239. The cubic root of 28426 is about 30.5191137024.

It can be divided in two parts, 28 and 426, that added together give a palindrome (454).

The spelling of 28426 in words is "twenty-eight thousand, four hundred twenty-six".