27672921 has 10 divisors (see below), whose sum is σ = 41338682. Its totient is φ = 18448560.

The previous prime is 27672917. The next prime is 27672959. The reversal of 27672921 is 12927672.

It can be written as a sum of positive squares in only one way, i.e., 27154521 + 518400 = 5211^2 + 720^2 .

It is not a de Polignac number, because 27672921 - 2² = 27672917 is a prime.

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 (27674921) 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 9 ways as a sum of consecutive naturals, for example, 170740 + ... + 170901.

Almost surely, 2^27672921 is an apocalyptic number.

It is an amenable number.

27672921 is a deficient number, since it is larger than the sum of its proper divisors (13665761).

27672921 is an equidigital number, since it uses as much as digits as its factorization.

27672921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341653 (or 341644 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 27672921 is about 5260.5057741628. The cubic root of 27672921 is about 302.4718768108.

The spelling of 27672921 in words is "twenty-seven million, six hundred seventy-two thousand, nine hundred twenty-one".