28013311 has 2 divisors, whose sum is σ = 28013312. Its totient is φ = 28013310.

The previous prime is 28013261. The next prime is 28013317. The reversal of 28013311 is 11331082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28013311 is a 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 (28013317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006655 + 14006656.

It is an arithmetic number, because the mean of its divisors is an integer number (14006656).

Almost surely, 2^28013311 is an apocalyptic number.

28013311 is a deficient number, since it is larger than the sum of its proper divisors (1).

28013311 is an equidigital number, since it uses as much as digits as its factorization.

28013311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28013311 is about 5292.7602439559. The cubic root of 28013311 is about 303.7070086547.

Adding to 28013311 its reverse (11331082), we get a palindrome (39344393).

The spelling of 28013311 in words is "twenty-eight million, thirteen thousand, three hundred eleven".