28257311 has 2 divisors, whose sum is σ = 28257312. Its totient is φ = 28257310.

The previous prime is 28257287. The next prime is 28257319. The reversal of 28257311 is 11375282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28257311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28257319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128655 + 14128656.

It is an arithmetic number, because the mean of its divisors is an integer number (14128656).

Almost surely, 2^28257311 is an apocalyptic number.

28257311 is a deficient number, since it is larger than the sum of its proper divisors (1).

28257311 is an equidigital number, since it uses as much as digits as its factorization.

28257311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 28257311 is about 5315.7606229024. The cubic root of 28257311 is about 304.5862381937.

The spelling of 28257311 in words is "twenty-eight million, two hundred fifty-seven thousand, three hundred eleven".