28213511 has 2 divisors, whose sum is σ = 28213512. Its totient is φ = 28213510.

The previous prime is 28213477. The next prime is 28213519. The reversal of 28213511 is 11531282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28213511 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28213519) 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 as a sum of consecutive naturals, namely, 14106755 + 14106756.

It is an arithmetic number, because the mean of its divisors is an integer number (14106756).

Almost surely, 2^28213511 is an apocalyptic number.

28213511 is a deficient number, since it is larger than the sum of its proper divisors (1).

28213511 is an equidigital number, since it uses as much as digits as its factorization.

28213511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 28213511 is about 5311.6392008494. The cubic root of 28213511 is about 304.4287830588.

Adding to 28213511 its reverse (11531282), we get a palindrome (39744793).

The spelling of 28213511 in words is "twenty-eight million, two hundred thirteen thousand, five hundred eleven".