27812969 has 8 divisors (see below), whose sum is σ = 30005640. Its totient is φ = 25682176.

The previous prime is 27812963. The next prime is 27812989. The reversal of 27812969 is 96921872.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3655744 + 24157225 = 1912^2 + 4915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27812969 - 2¹² = 27808873 is a prime.

It is a super-2 number, since 2×27812969² = 1547122489189922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27812963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14534 + ... + 16335.

It is an arithmetic number, because the mean of its divisors is an integer number (3750705).

Almost surely, 2^27812969 is an apocalyptic number.

It is an amenable number.

27812969 is a deficient number, since it is larger than the sum of its proper divisors (2192671).

27812969 is a wasteful number, since it uses less digits than its factorization.

27812969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30939.

The product of its digits is 108864, while the sum is 44.

The square root of 27812969 is about 5273.8002427092. The cubic root of 27812969 is about 302.9812715571.

The spelling of 27812969 in words is "twenty-seven million, eight hundred twelve thousand, nine hundred sixty-nine".