27861697 has 4 divisors (see below), whose sum is σ = 27912276. Its totient is φ = 27811120.

The previous prime is 27861683. The next prime is 27861727. The reversal of 27861697 is 79616872.

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 9960336 + 17901361 = 3156^2 + 4231^2 .

It is a cyclic number.

It is not a de Polignac number, because 27861697 - 2⁷ = 27861569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27861637) 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, 24454 + ... + 25567.

It is an arithmetic number, because the mean of its divisors is an integer number (6978069).

Almost surely, 2^27861697 is an apocalyptic number.

It is an amenable number.

27861697 is a deficient number, since it is larger than the sum of its proper divisors (50579).

27861697 is an equidigital number, since it uses as much as digits as its factorization.

27861697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50578.

The product of its digits is 254016, while the sum is 46.

The square root of 27861697 is about 5278.4180395266. The cubic root of 27861697 is about 303.1581082199.

The spelling of 27861697 in words is "twenty-seven million, eight hundred sixty-one thousand, six hundred ninety-seven".