28063661 has 2 divisors, whose sum is σ = 28063662. Its totient is φ = 28063660.

The previous prime is 28063643. The next prime is 28063669. The reversal of 28063661 is 16636082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23522500 + 4541161 = 4850^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 28063661 - 2⁶ = 28063597 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 (28063669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14031830 + 14031831.

It is an arithmetic number, because the mean of its divisors is an integer number (14031831).

Almost surely, 2^28063661 is an apocalyptic number.

It is an amenable number.

28063661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28063661 is an equidigital number, since it uses as much as digits as its factorization.

28063661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28063661 is about 5297.5146059261. The cubic root of 28063661 is about 303.8888566756. Note that the first 4 decimals are identical.

The spelling of 28063661 in words is "twenty-eight million, sixty-three thousand, six hundred sixty-one".