28144369 has 8 divisors (see below), whose sum is σ = 30746880. Its totient is φ = 25549200.

The previous prime is 28144331. The next prime is 28144393. The reversal of 28144369 is 96344182.

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 28144369 - 2¹¹ = 28142321 is a prime.

It is a super-2 number, since 2×28144369² = 1584211012816322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28144169) 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, 8992 + ... + 11710.

It is an arithmetic number, because the mean of its divisors is an integer number (3843360).

Almost surely, 2^28144369 is an apocalyptic number.

It is an amenable number.

28144369 is a deficient number, since it is larger than the sum of its proper divisors (2602511).

28144369 is a wasteful number, since it uses less digits than its factorization.

28144369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671.

The product of its digits is 41472, while the sum is 37.

The square root of 28144369 is about 5305.1266714377. The cubic root of 28144369 is about 304.1798948230.

The spelling of 28144369 in words is "twenty-eight million, one hundred forty-four thousand, three hundred sixty-nine".