28444 has 12 divisors (see below), whose sum is σ = 53704. Its totient is φ = 13104.

The previous prime is 28439. The next prime is 28447. The reversal of 28444 is 44482.

28444 = T₁₇ + T₁₈ + ... + T₅₅.

28444 is nontrivially palindromic in base 3.

It is a super-2 number, since 2×28444² = 1618122272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

28444 is a modest number, since divided by 444 gives 28 as remainder.

It is a nialpdrome in base 13 and base 15.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222 + ... + 325.

2²⁸⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

28444 is a deficient number, since it is larger than the sum of its proper divisors (25260).

28444 is a wasteful number, since it uses less digits than its factorization.

28444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 562 counting only the distinct ones).

The product of its digits is 1024, while the sum is 22.

The square root of 28444 is about 168.6534909215. The cubic root of 28444 is about 30.5255541458.

The spelling of 28444 in words is "twenty-eight thousand, four hundred forty-four".