28944593 has 4 divisors (see below), whose sum is σ = 29030820. Its totient is φ = 28858368.

The previous prime is 28944589. The next prime is 28944631. The reversal of 28944593 is 39544982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19775809 + 9168784 = 4447^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 28944593 - 2² = 28944589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28944493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42608 + ... + 43281.

It is an arithmetic number, because the mean of its divisors is an integer number (7257705).

Almost surely, 2^28944593 is an apocalyptic number.

It is an amenable number.

28944593 is a deficient number, since it is larger than the sum of its proper divisors (86227).

28944593 is an equidigital number, since it uses as much as digits as its factorization.

28944593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86226.

The product of its digits is 311040, while the sum is 44.

The square root of 28944593 is about 5380.0179367731. The cubic root of 28944593 is about 307.0358936200.

The spelling of 28944593 in words is "twenty-eight million, nine hundred forty-four thousand, five hundred ninety-three".