28012757 has 2 divisors, whose sum is σ = 28012758. Its totient is φ = 28012756.

The previous prime is 28012741. The next prime is 28012769. The reversal of 28012757 is 75721082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14070001 + 13942756 = 3751^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 28012757 - 2⁴ = 28012741 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 (28012157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14006378 + 14006379.

It is an arithmetic number, because the mean of its divisors is an integer number (14006379).

Almost surely, 2^28012757 is an apocalyptic number.

It is an amenable number.

28012757 is a deficient number, since it is larger than the sum of its proper divisors (1).

28012757 is an equidigital number, since it uses as much as digits as its factorization.

28012757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28012757 is about 5292.7079080561. The cubic root of 28012757 is about 303.7050065732.

The spelling of 28012757 in words is "twenty-eight million, twelve thousand, seven hundred fifty-seven".