28311757 has 2 divisors, whose sum is σ = 28311758. Its totient is φ = 28311756.

The previous prime is 28311737. The next prime is 28311761. The reversal of 28311757 is 75711382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26739241 + 1572516 = 5171^2 + 1254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28311757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28311727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155878 + 14155879.

It is an arithmetic number, because the mean of its divisors is an integer number (14155879).

Almost surely, 2^28311757 is an apocalyptic number.

It is an amenable number.

28311757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311757 is an equidigital number, since it uses as much as digits as its factorization.

28311757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 28311757 is about 5320.8793446196. The cubic root of 28311757 is about 304.7817376017.

The spelling of 28311757 in words is "twenty-eight million, three hundred eleven thousand, seven hundred fifty-seven".