28493389 has 4 divisors (see below), whose sum is σ = 29732256. Its totient is φ = 27254524.

The previous prime is 28493323. The next prime is 28493429. The reversal of 28493389 is 98339482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28493389 - 2¹¹ = 28491341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28493089) 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, 619399 + ... + 619444.

It is an arithmetic number, because the mean of its divisors is an integer number (7433064).

Almost surely, 2^28493389 is an apocalyptic number.

It is an amenable number.

28493389 is a deficient number, since it is larger than the sum of its proper divisors (1238867).

28493389 is a wasteful number, since it uses less digits than its factorization.

28493389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238866.

The product of its digits is 373248, while the sum is 46.

The square root of 28493389 is about 5337.9199132246. The cubic root of 28493389 is about 305.4321170503.

It can be divided in two parts, 28493 and 389, that added together give a palindrome (28882).

The spelling of 28493389 in words is "twenty-eight million, four hundred ninety-three thousand, three hundred eighty-nine".