28402 has 8 divisors (see below), whose sum is σ = 46512. Its totient is φ = 12900.

The previous prime is 28393. The next prime is 28403. The reversal of 28402 is 20482.

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

It is not an unprimeable number, because it can be changed into a prime (28403) by changing a digit.

28402 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 in 3 ways as a sum of consecutive naturals, for example, 624 + ... + 667.

It is an arithmetic number, because the mean of its divisors is an integer number (5814).

2²⁸⁴⁰² is an apocalyptic number.

28402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28402 is a deficient number, since it is larger than the sum of its proper divisors (18110).

28402 is a wasteful number, since it uses less digits than its factorization.

28402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 28402 is about 168.5289292674. The cubic root of 28402 is about 30.5105222138.

Adding to 28402 its reverse (20482), we get a palindrome (48884).

The spelling of 28402 in words is "twenty-eight thousand, four hundred two".