28409211 has 10 divisors (see below), whose sum is σ = 42438572. Its totient is φ = 18939420.

The previous prime is 28409207. The next prime is 28409221. The reversal of 28409211 is 11290482.

It is not a de Polignac number, because 28409211 - 2² = 28409207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28409221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 175285 + ... + 175446.

Almost surely, 2^28409211 is an apocalyptic number.

28409211 is a deficient number, since it is larger than the sum of its proper divisors (14029361).

28409211 is an equidigital number, since it uses as much as digits as its factorization.

28409211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350743 (or 350734 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28409211 is about 5330.0291744042. The cubic root of 28409211 is about 305.1310410663.

Adding to 28409211 its reverse (11290482), we get a palindrome (39699693).

The spelling of 28409211 in words is "twenty-eight million, four hundred nine thousand, two hundred eleven".