27823661 has 2 divisors, whose sum is σ = 27823662. Its totient is φ = 27823660.

The previous prime is 27823643. The next prime is 27823669. The reversal of 27823661 is 16632872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 11095561 = 4090^2 + 3331^2 .

It is a cyclic number.

It is not a de Polignac number, because 27823661 - 2¹⁸ = 27561517 is a prime.

It is a super-2 number, since 2×27823661² = 1548312222885842, which contains 22 as substring.

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 (27823669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13911830 + 13911831.

It is an arithmetic number, because the mean of its divisors is an integer number (13911831).

Almost surely, 2^27823661 is an apocalyptic number.

It is an amenable number.

27823661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27823661 is an equidigital number, since it uses as much as digits as its factorization.

27823661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 27823661 is about 5274.8138355775. The cubic root of 27823661 is about 303.0200911061.

The spelling of 27823661 in words is "twenty-seven million, eight hundred twenty-three thousand, six hundred sixty-one".