28169543 has 8 divisors (see below), whose sum is σ = 29002512. Its totient is φ = 27340416.

The previous prime is 28169539. The next prime is 28169551. The reversal of 28169543 is 34596182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28169543 - 2² = 28169539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28169497 and 28169506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28169593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21071 + ... + 22367.

It is an arithmetic number, because the mean of its divisors is an integer number (3625314).

Almost surely, 2^28169543 is an apocalyptic number.

28169543 is a deficient number, since it is larger than the sum of its proper divisors (832969).

28169543 is a wasteful number, since it uses less digits than its factorization.

28169543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its digits is 51840, while the sum is 38.

The square root of 28169543 is about 5307.4987517662. The cubic root of 28169543 is about 304.2705600016.

The spelling of 28169543 in words is "twenty-eight million, one hundred sixty-nine thousand, five hundred forty-three".