28312 has 8 divisors (see below), whose sum is σ = 53100. Its totient is φ = 14152.

The previous prime is 28309. The next prime is 28319. The reversal of 28312 is 21382.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1762 + ... + 1777.

2²⁸³¹² is an apocalyptic number.

It is an amenable number.

28312 is a deficient number, since it is larger than the sum of its proper divisors (24788).

28312 is a wasteful number, since it uses less digits than its factorization.

28312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545 (or 3541 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 28312 is about 168.2617009304. The cubic root of 28312 is about 30.4782609580.

Adding to 28312 its reverse (21382), we get a palindrome (49694).

The spelling of 28312 in words is "twenty-eight thousand, three hundred twelve".