27620991 has 12 divisors (see below), whose sum is σ = 40067040. Its totient is φ = 18335520.

The previous prime is 27620977. The next prime is 27621019. The reversal of 27620991 is 19902672.

27620991 is a `hidden beast` number, since 27 + 620 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 27620991 - 2⁵ = 27620959 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27620941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4270 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (3338920).

Almost surely, 2^27620991 is an apocalyptic number.

27620991 is a deficient number, since it is larger than the sum of its proper divisors (12446049).

27620991 is a wasteful number, since it uses less digits than its factorization.

27620991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13086 (or 13083 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 27620991 is about 5255.5676192016. The cubic root of 27620991 is about 302.2825557521.

The spelling of 27620991 in words is "twenty-seven million, six hundred twenty thousand, nine hundred ninety-one".