28278 has 12 divisors (see below), whose sum is σ = 61308. Its totient is φ = 9420.

The previous prime is 28277. The next prime is 28279. The reversal of 28278 is 87282.

It is an interprime number because it is at equal distance from previous prime (28277) and next prime (28279).

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 768 + ... + 803.

It is an arithmetic number, because the mean of its divisors is an integer number (5109).

2²⁸²⁷⁸ is an apocalyptic number.

28278 is an abundant number, since it is smaller than the sum of its proper divisors (33030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28278 is a wasteful number, since it uses less digits than its factorization.

28278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1576 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 28278 is about 168.1606374869. The cubic root of 28278 is about 30.4660555803.

The spelling of 28278 in words is "twenty-eight thousand, two hundred seventy-eight".