28169844 has 12 divisors (see below), whose sum is σ = 65729664. Its totient is φ = 9389944.

The previous prime is 28169821. The next prime is 28169881. The reversal of 28169844 is 44896182.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28169844² = 1587080221968672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28169796 and 28169805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173732 + ... + 1173755.

It is an arithmetic number, because the mean of its divisors is an integer number (5477472).

Almost surely, 2^28169844 is an apocalyptic number.

It is an amenable number.

28169844 is an abundant number, since it is smaller than the sum of its proper divisors (37559820).

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

28169844 is a wasteful number, since it uses less digits than its factorization.

28169844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347494 (or 2347492 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 28169844 is about 5307.5271077970. The cubic root of 28169844 is about 304.2716437384.

It can be divided in two parts, 281 and 69844, that added together give a triangular number (70125 = T₃₇₄).

The spelling of 28169844 in words is "twenty-eight million, one hundred sixty-nine thousand, eight hundred forty-four".