28207757 has 2 divisors, whose sum is σ = 28207758. Its totient is φ = 28207756.

The previous prime is 28207747. The next prime is 28207759. The reversal of 28207757 is 75770282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27520516 + 687241 = 5246^2 + 829^2 .

It is a cyclic number.

It is not a de Polignac number, because 28207757 - 2⁶ = 28207693 is a prime.

Together with 28207759, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28207757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28207759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103878 + 14103879.

It is an arithmetic number, because the mean of its divisors is an integer number (14103879).

Almost surely, 2^28207757 is an apocalyptic number.

It is an amenable number.

28207757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207757 is an equidigital number, since it uses as much as digits as its factorization.

28207757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 28207757 is about 5311.0975325256. The cubic root of 28207757 is about 304.4080860919.

The spelling of 28207757 in words is "twenty-eight million, two hundred seven thousand, seven hundred fifty-seven".