28711517 has 2 divisors, whose sum is σ = 28711518. Its totient is φ = 28711516.

The previous prime is 28711493. The next prime is 28711547. The reversal of 28711517 is 71511782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24492601 + 4218916 = 4949^2 + 2054^2 .

It is a cyclic number.

It is not a de Polignac number, because 28711517 - 2¹⁸ = 28449373 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 (28711547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14355758 + 14355759.

It is an arithmetic number, because the mean of its divisors is an integer number (14355759).

Almost surely, 2^28711517 is an apocalyptic number.

It is an amenable number.

28711517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28711517 is an equidigital number, since it uses as much as digits as its factorization.

28711517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920, while the sum is 32.

The square root of 28711517 is about 5358.3128874675. The cubic root of 28711517 is about 306.2095372336.

The spelling of 28711517 in words is "twenty-eight million, seven hundred eleven thousand, five hundred seventeen".