27720571 has 2 divisors, whose sum is σ = 27720572. Its totient is φ = 27720570.

The previous prime is 27720533. The next prime is 27720577. The reversal of 27720571 is 17502772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27720571 - 2¹⁹ = 27196283 is a prime.

It is not a weakly prime, because it can be changed into another prime (27720577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860285 + 13860286.

It is an arithmetic number, because the mean of its divisors is an integer number (13860286).

Almost surely, 2^27720571 is an apocalyptic number.

27720571 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720571 is an equidigital number, since it uses as much as digits as its factorization.

27720571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 27720571 is about 5265.0328583970. The cubic root of 27720571 is about 302.6453860256.

The spelling of 27720571 in words is "twenty-seven million, seven hundred twenty thousand, five hundred seventy-one".