28011311 has 2 divisors, whose sum is σ = 28011312. Its totient is φ = 28011310.

The previous prime is 28011299. The next prime is 28011329. The reversal of 28011311 is 11311082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28011311 - 2¹⁰ = 28010287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28011311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28011391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005655 + 14005656.

It is an arithmetic number, because the mean of its divisors is an integer number (14005656).

Almost surely, 2^28011311 is an apocalyptic number.

28011311 is a deficient number, since it is larger than the sum of its proper divisors (1).

28011311 is an equidigital number, since it uses as much as digits as its factorization.

28011311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 28011311 is about 5292.5713032514. The cubic root of 28011311 is about 303.6997807994.

Adding to 28011311 its reverse (11311082), we get a palindrome (39322393).

The spelling of 28011311 in words is "twenty-eight million, eleven thousand, three hundred eleven".