28214409 has 4 divisors (see below), whose sum is σ = 37619216. Its totient is φ = 18809604.

The previous prime is 28214401. The next prime is 28214413. The reversal of 28214409 is 90441282.

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 not a de Polignac number, because 28214409 - 2³ = 28214401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28214401) 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, 4702399 + ... + 4702404.

It is an arithmetic number, because the mean of its divisors is an integer number (9404804).

Almost surely, 2^28214409 is an apocalyptic number.

It is an amenable number.

28214409 is a deficient number, since it is larger than the sum of its proper divisors (9404807).

28214409 is an equidigital number, since it uses as much as digits as its factorization.

28214409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9404806.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28214409 is about 5311.7237315207. The cubic root of 28214409 is about 304.4320128842.

The spelling of 28214409 in words is "twenty-eight million, two hundred fourteen thousand, four hundred nine".