28093661 has 2 divisors, whose sum is σ = 28093662. Its totient is φ = 28093660.

The previous prime is 28093633. The next prime is 28093669. The reversal of 28093661 is 16639082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 109561 = 5290^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 28093661 - 2¹⁴ = 28077277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28093669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14046830 + 14046831.

It is an arithmetic number, because the mean of its divisors is an integer number (14046831).

Almost surely, 2^28093661 is an apocalyptic number.

It is an amenable number.

28093661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28093661 is an equidigital number, since it uses as much as digits as its factorization.

28093661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28093661 is about 5300.3453661059. The cubic root of 28093661 is about 303.9971036485.

The spelling of 28093661 in words is "twenty-eight million, ninety-three thousand, six hundred sixty-one".