28642 has 4 divisors (see below), whose sum is σ = 42966. Its totient is φ = 14320.

The previous prime is 28631. The next prime is 28643. The reversal of 28642 is 24682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28561 + 81 = 169^2 + 9^2 .

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28643) by changing a digit.

28642 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, 7159 + ... + 7162.

2²⁸⁶⁴² is an apocalyptic number.

28642 is a deficient number, since it is larger than the sum of its proper divisors (14324).

28642 is a wasteful number, since it uses less digits than its factorization.

28642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14323.

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

The square root of 28642 is about 169.2394753005. The cubic root of 28642 is about 30.5962203599.

The spelling of 28642 in words is "twenty-eight thousand, six hundred forty-two".