27565401 has 4 divisors (see below), whose sum is σ = 36753872. Its totient is φ = 18376932.

The previous prime is 27565397. The next prime is 27565411. The reversal of 27565401 is 10456572.

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 not a de Polignac number, because 27565401 - 2² = 27565397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27565411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4594231 + ... + 4594236.

It is an arithmetic number, because the mean of its divisors is an integer number (9188468).

Almost surely, 2^27565401 is an apocalyptic number.

It is an amenable number.

27565401 is a deficient number, since it is larger than the sum of its proper divisors (9188471).

27565401 is an equidigital number, since it uses as much as digits as its factorization.

27565401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9188470.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 27565401 is about 5250.2762784448. The cubic root of 27565401 is about 302.0796282870.

It can be divided in two parts, 27565 and 401, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 27565401 in words is "twenty-seven million, five hundred sixty-five thousand, four hundred one".