27807145 has 4 divisors (see below), whose sum is σ = 33368580. Its totient is φ = 22245712.

The previous prime is 27807119. The next prime is 27807149. The reversal of 27807145 is 54170872.

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 12938409 + 14868736 = 3597^2 + 3856^2 .

It is a cyclic number.

It is not a de Polignac number, because 27807145 - 2¹¹ = 27805097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27807145.

It is not an unprimeable number, because it can be changed into a prime (27807149) 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, 2780710 + ... + 2780719.

It is an arithmetic number, because the mean of its divisors is an integer number (8342145).

Almost surely, 2^27807145 is an apocalyptic number.

It is an amenable number.

27807145 is a deficient number, since it is larger than the sum of its proper divisors (5561435).

27807145 is an equidigital number, since it uses as much as digits as its factorization.

27807145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561434.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 27807145 is about 5273.2480503007. The cubic root of 27807145 is about 302.9601221178.

The spelling of 27807145 in words is "twenty-seven million, eight hundred seven thousand, one hundred forty-five".