27750661 has 2 divisors, whose sum is σ = 27750662. Its totient is φ = 27750660.

The previous prime is 27750623. The next prime is 27750677. The reversal of 27750661 is 16605772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 5377761 = 4730^2 + 2319^2 .

It is a cyclic number.

It is not a de Polignac number, because 27750661 - 2¹¹ = 27748613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27750601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13875330 + 13875331.

It is an arithmetic number, because the mean of its divisors is an integer number (13875331).

Almost surely, 2^27750661 is an apocalyptic number.

It is an amenable number.

27750661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27750661 is an equidigital number, since it uses as much as digits as its factorization.

27750661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 27750661 is about 5267.8896153963. The cubic root of 27750661 is about 302.7548511427.

The spelling of 27750661 in words is "twenty-seven million, seven hundred fifty thousand, six hundred sixty-one".