28870 has 8 divisors (see below), whose sum is σ = 51984. Its totient is φ = 11544.

The previous prime is 28867. The next prime is 28871. The reversal of 28870 is 7882.

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

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (6498).

2²⁸⁸⁷⁰ is an apocalyptic number.

28870 is a deficient number, since it is larger than the sum of its proper divisors (23114).

28870 is a wasteful number, since it uses less digits than its factorization.

28870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28870 is about 169.9117417956. The cubic root of 28870 is about 30.6771913046.

It can be divided in two parts, 28 and 870, that added together give a palindrome (898).

The spelling of 28870 in words is "twenty-eight thousand, eight hundred seventy".