27871969 has 4 divisors (see below), whose sum is σ = 27885844. Its totient is φ = 27858096.

The previous prime is 27871967. The next prime is 27871979. The reversal of 27871969 is 96917872.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18490000 + 9381969 = 4300^2 + 3063^2 .

It is a cyclic number.

It is not a de Polignac number, because 27871969 - 2¹ = 27871967 is a prime.

It is a super-2 number, since 2×27871969² = 1553693311873922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27871967) 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, 3282 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (6971461).

Almost surely, 2^27871969 is an apocalyptic number.

It is an amenable number.

27871969 is a deficient number, since it is larger than the sum of its proper divisors (13875).

27871969 is a wasteful number, since it uses less digits than its factorization.

27871969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13874.

The product of its digits is 381024, while the sum is 49.

The square root of 27871969 is about 5279.3909686630. The cubic root of 27871969 is about 303.1953595698.

The spelling of 27871969 in words is "twenty-seven million, eight hundred seventy-one thousand, nine hundred sixty-nine".