27955643 has 2 divisors, whose sum is σ = 27955644. Its totient is φ = 27955642.

The previous prime is 27955639. The next prime is 27955693. The reversal of 27955643 is 34655972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27955643 - 2² = 27955639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27955643.

It is not a weakly prime, because it can be changed into another prime (27955693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977821 + 13977822.

It is an arithmetic number, because the mean of its divisors is an integer number (13977822).

Almost surely, 2^27955643 is an apocalyptic number.

27955643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27955643 is an equidigital number, since it uses as much as digits as its factorization.

27955643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 27955643 is about 5287.3096183220. The cubic root of 27955643 is about 303.4984624660.

The spelling of 27955643 in words is "twenty-seven million, nine hundred fifty-five thousand, six hundred forty-three".