27920261 has 4 divisors (see below), whose sum is σ = 27969900. Its totient is φ = 27870624.

The previous prime is 27920257. The next prime is 27920267. The reversal of 27920261 is 16202972.

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 1716100 + 26204161 = 1310^2 + 5119^2 .

It is a cyclic number.

It is not a de Polignac number, because 27920261 - 2² = 27920257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27920267) 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 3 ways as a sum of consecutive naturals, for example, 23966 + ... + 25103.

It is an arithmetic number, because the mean of its divisors is an integer number (6992475).

Almost surely, 2^27920261 is an apocalyptic number.

It is an amenable number.

27920261 is a deficient number, since it is larger than the sum of its proper divisors (49639).

27920261 is an equidigital number, since it uses as much as digits as its factorization.

27920261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49638.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 27920261 is about 5283.9626228807. The cubic root of 27920261 is about 303.3703676824.

The spelling of 27920261 in words is "twenty-seven million, nine hundred twenty thousand, two hundred sixty-one".