28344489 has 16 divisors (see below), whose sum is σ = 39217920. Its totient is φ = 18195840.

The previous prime is 28344473. The next prime is 28344497. The reversal of 28344489 is 98444382.

It is not a de Polignac number, because 28344489 - 2⁴ = 28344473 is a prime.

It is a super-2 number, since 2×28344489² = 1606820113342242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28344489.

It is not an unprimeable number, because it can be changed into a prime (28344499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8259 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (2451120).

Almost surely, 2^28344489 is an apocalyptic number.

It is an amenable number.

28344489 is a deficient number, since it is larger than the sum of its proper divisors (10873431).

28344489 is a wasteful number, since it uses less digits than its factorization.

28344489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040.

The product of its digits is 221184, while the sum is 42.

The square root of 28344489 is about 5323.9542635150. The cubic root of 28344489 is about 304.8991478793.

The spelling of 28344489 in words is "twenty-eight million, three hundred forty-four thousand, four hundred eighty-nine".