27800545 has 4 divisors (see below), whose sum is σ = 33360660. Its totient is φ = 22240432.

The previous prime is 27800543. The next prime is 27800561. The reversal of 27800545 is 54500872.

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 10419984 + 17380561 = 3228^2 + 4169^2 .

It is a cyclic number.

It is not a de Polignac number, because 27800545 - 2¹ = 27800543 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (27800543) 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, 2780050 + ... + 2780059.

It is an arithmetic number, because the mean of its divisors is an integer number (8340165).

Almost surely, 2^27800545 is an apocalyptic number.

It is an amenable number.

27800545 is a deficient number, since it is larger than the sum of its proper divisors (5560115).

27800545 is an equidigital number, since it uses as much as digits as its factorization.

27800545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560114.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 27800545 is about 5272.6222129032. The cubic root of 27800545 is about 302.9361511201.

The spelling of 27800545 in words is "twenty-seven million, eight hundred thousand, five hundred forty-five".