28475389 has 4 divisors (see below), whose sum is σ = 28486080. Its totient is φ = 28464700.

The previous prime is 28475383. The next prime is 28475393. The reversal of 28475389 is 98357482.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28475389 - 2⁷ = 28475261 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 (28475383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2214 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (7121520).

Almost surely, 2^28475389 is an apocalyptic number.

It is an amenable number.

28475389 is a deficient number, since it is larger than the sum of its proper divisors (10691).

28475389 is an equidigital number, since it uses as much as digits as its factorization.

28475389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10690.

The product of its digits is 483840, while the sum is 46.

The square root of 28475389 is about 5336.2335968359. The cubic root of 28475389 is about 305.3677870846.

The spelling of 28475389 in words is "twenty-eight million, four hundred seventy-five thousand, three hundred eighty-nine".