27640471 has 2 divisors, whose sum is σ = 27640472. Its totient is φ = 27640470.

The previous prime is 27640447. The next prime is 27640493. The reversal of 27640471 is 17404672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27640471 - 2⁵ = 27640439 is a prime.

It is a super-3 number, since 3×27640471³ (a number of 23 digits) contains 333 as substring.

It is equal to p_1720489 and since 27640471 and 1720489 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27670471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820235 + 13820236.

It is an arithmetic number, because the mean of its divisors is an integer number (13820236).

Almost surely, 2^27640471 is an apocalyptic number.

27640471 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640471 is an equidigital number, since it uses as much as digits as its factorization.

27640471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 27640471 is about 5257.4205652582. The cubic root of 27640471 is about 302.3536017237.

The spelling of 27640471 in words is "twenty-seven million, six hundred forty thousand, four hundred seventy-one".