28222511 has 2 divisors, whose sum is σ = 28222512. Its totient is φ = 28222510.

The previous prime is 28222487. The next prime is 28222517. The reversal of 28222511 is 11522282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28222511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28222517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111255 + 14111256.

It is an arithmetic number, because the mean of its divisors is an integer number (14111256).

Almost surely, 2^28222511 is an apocalyptic number.

28222511 is a deficient number, since it is larger than the sum of its proper divisors (1).

28222511 is an equidigital number, since it uses as much as digits as its factorization.

28222511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 28222511 is about 5312.4863293942. The cubic root of 28222511 is about 304.4611501490.

Adding to 28222511 its reverse (11522282), we get a palindrome (39744793).

The spelling of 28222511 in words is "twenty-eight million, two hundred twenty-two thousand, five hundred eleven".