27638731 has 2 divisors, whose sum is σ = 27638732. Its totient is φ = 27638730.

The previous prime is 27638729. The next prime is 27638761. The reversal of 27638731 is 13783672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27638731 - 2¹ = 27638729 is a prime.

It is a super-3 number, since 3×27638731³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 27638729, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27638761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13819365 + 13819366.

It is an arithmetic number, because the mean of its divisors is an integer number (13819366).

Almost surely, 2^27638731 is an apocalyptic number.

27638731 is a deficient number, since it is larger than the sum of its proper divisors (1).

27638731 is an equidigital number, since it uses as much as digits as its factorization.

27638731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 27638731 is about 5257.2550822649. The cubic root of 27638731 is about 302.3472570862.

The spelling of 27638731 in words is "twenty-seven million, six hundred thirty-eight thousand, seven hundred thirty-one".