28943489 has 4 divisors (see below), whose sum is σ = 28972080. Its totient is φ = 28914900.

The previous prime is 28943483. The next prime is 28943501. The reversal of 28943489 is 98434982.

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 28943489 - 2²⁰ = 27894913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28943483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12719 + ... + 14820.

It is an arithmetic number, because the mean of its divisors is an integer number (7243020).

Almost surely, 2^28943489 is an apocalyptic number.

It is an amenable number.

28943489 is a deficient number, since it is larger than the sum of its proper divisors (28591).

28943489 is a wasteful number, since it uses less digits than its factorization.

28943489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28590.

The product of its digits is 497664, while the sum is 47.

The square root of 28943489 is about 5379.9153339063. The cubic root of 28943489 is about 307.0319899325.

The spelling of 28943489 in words is "twenty-eight million, nine hundred forty-three thousand, four hundred eighty-nine".