27630991 has 2 divisors, whose sum is σ = 27630992. Its totient is φ = 27630990.

The previous prime is 27630947. The next prime is 27631003. The reversal of 27630991 is 19903672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27630991 - 2⁹ = 27630479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27630991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27630191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13815495 + 13815496.

It is an arithmetic number, because the mean of its divisors is an integer number (13815496).

Almost surely, 2^27630991 is an apocalyptic number.

27630991 is a deficient number, since it is larger than the sum of its proper divisors (1).

27630991 is an equidigital number, since it uses as much as digits as its factorization.

27630991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 27630991 is about 5256.5189051310. The cubic root of 27630991 is about 302.3190311611.

The spelling of 27630991 in words is "twenty-seven million, six hundred thirty thousand, nine hundred ninety-one".