27261661 has 4 divisors (see below), whose sum is σ = 31156192. Its totient is φ = 23367132.

The previous prime is 27261649. The next prime is 27261667. The reversal of 27261661 is 16616272.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27261661 - 2⁵ = 27261629 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 (27261667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1947255 + ... + 1947268.

It is an arithmetic number, because the mean of its divisors is an integer number (7789048).

Almost surely, 2^27261661 is an apocalyptic number.

It is an amenable number.

27261661 is a deficient number, since it is larger than the sum of its proper divisors (3894531).

27261661 is an equidigital number, since it uses as much as digits as its factorization.

27261661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894530.

The product of its digits is 6048, while the sum is 31.

The square root of 27261661 is about 5221.2700562220. The cubic root of 27261661 is about 300.9660009501.

The spelling of 27261661 in words is "twenty-seven million, two hundred sixty-one thousand, six hundred sixty-one".