28016657 has 2 divisors, whose sum is σ = 28016658. Its totient is φ = 28016656.

The previous prime is 28016633. The next prime is 28016669. The reversal of 28016657 is 75661082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 13278736 = 3839^2 + 3644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28016657 is a prime.

It is not a weakly prime, because it can be changed into another prime (28016627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14008328 + 14008329.

It is an arithmetic number, because the mean of its divisors is an integer number (14008329).

Almost surely, 2^28016657 is an apocalyptic number.

It is an amenable number.

28016657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28016657 is an equidigital number, since it uses as much as digits as its factorization.

28016657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28016657 is about 5293.0763266743. The cubic root of 28016657 is about 303.7191000874.

The spelling of 28016657 in words is "twenty-eight million, sixteen thousand, six hundred fifty-seven".