27750145 has 4 divisors (see below), whose sum is σ = 33300180. Its totient is φ = 22200112.

The previous prime is 27750139. The next prime is 27750161. The reversal of 27750145 is 54105772.

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 11806096 + 15944049 = 3436^2 + 3993^2 .

It is a cyclic number.

It is not a de Polignac number, because 27750145 - 2⁵ = 27750113 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 an unprimeable number.

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, 2775010 + ... + 2775019.

It is an arithmetic number, because the mean of its divisors is an integer number (8325045).

Almost surely, 2^27750145 is an apocalyptic number.

It is an amenable number.

27750145 is a deficient number, since it is larger than the sum of its proper divisors (5550035).

27750145 is an equidigital number, since it uses as much as digits as its factorization.

27750145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550034.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 27750145 is about 5267.8406391993. The cubic root of 27750145 is about 302.7529746412.

The spelling of 27750145 in words is "twenty-seven million, seven hundred fifty thousand, one hundred forty-five".