27988563 has 4 divisors (see below), whose sum is σ = 37318088. Its totient is φ = 18659040.

The previous prime is 27988559. The next prime is 27988589. The reversal of 27988563 is 36588972.

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

It is not a de Polignac number, because 27988563 - 2² = 27988559 is a prime.

It is a super-3 number, since 3×27988563³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27988523) 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, 4664758 + ... + 4664763.

It is an arithmetic number, because the mean of its divisors is an integer number (9329522).

Almost surely, 2^27988563 is an apocalyptic number.

27988563 is a deficient number, since it is larger than the sum of its proper divisors (9329525).

27988563 is an equidigital number, since it uses as much as digits as its factorization.

27988563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9329524.

The product of its digits is 725760, while the sum is 48.

The square root of 27988563 is about 5290.4218168309. The cubic root of 27988563 is about 303.6175469522.

The spelling of 27988563 in words is "twenty-seven million, nine hundred eighty-eight thousand, five hundred sixty-three".