28000757 has 2 divisors, whose sum is σ = 28000758. Its totient is φ = 28000756.

The previous prime is 28000741. The next prime is 28000771. The reversal of 28000757 is 75700082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 8561476 = 4409^2 + 2926^2 .

It is a cyclic number.

It is not a de Polignac number, because 28000757 - 2⁴ = 28000741 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 (28000787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000378 + 14000379.

It is an arithmetic number, because the mean of its divisors is an integer number (14000379).

Almost surely, 2^28000757 is an apocalyptic number.

It is an amenable number.

28000757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000757 is an equidigital number, since it uses as much as digits as its factorization.

28000757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 28000757 is about 5291.5741514222. The cubic root of 28000757 is about 303.6616337080.

It can be divided in two parts, 2800075 and 7, that added together give a palindrome (2800082).

The spelling of 28000757 in words is "twenty-eight million, seven hundred fifty-seven", and thus it is an aban number.