27661429 has 4 divisors (see below), whose sum is σ = 28336140. Its totient is φ = 26986720.

The previous prime is 27661411. The next prime is 27661471. The reversal of 27661429 is 92416672.

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 3602404 + 24059025 = 1898^2 + 4905^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661429 - 2⁷ = 27661301 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 (27661129) 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, 337294 + ... + 337375.

It is an arithmetic number, because the mean of its divisors is an integer number (7084035).

Almost surely, 2^27661429 is an apocalyptic number.

It is an amenable number.

27661429 is a deficient number, since it is larger than the sum of its proper divisors (674711).

27661429 is an equidigital number, since it uses as much as digits as its factorization.

27661429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674710.

The product of its digits is 36288, while the sum is 37.

The square root of 27661429 is about 5259.4133703294. The cubic root of 27661429 is about 302.4300008786.

The spelling of 27661429 in words is "twenty-seven million, six hundred sixty-one thousand, four hundred twenty-nine".