27961663 has 4 divisors (see below), whose sum is σ = 28556640. Its totient is φ = 27366688.

The previous prime is 27961643. The next prime is 27961667. The reversal of 27961663 is 36616972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27961663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27961667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297418 + ... + 297511.

It is an arithmetic number, because the mean of its divisors is an integer number (7139160).

Almost surely, 2^27961663 is an apocalyptic number.

27961663 is a deficient number, since it is larger than the sum of its proper divisors (594977).

27961663 is an equidigital number, since it uses as much as digits as its factorization.

27961663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594976.

The product of its digits is 81648, while the sum is 40.

The square root of 27961663 is about 5287.8788753148. The cubic root of 27961663 is about 303.5202461373.

The spelling of 27961663 in words is "twenty-seven million, nine hundred sixty-one thousand, six hundred sixty-three".