27809146 has 4 divisors (see below), whose sum is σ = 41713722. Its totient is φ = 13904572.

The previous prime is 27809123. The next prime is 27809149. The reversal of 27809146 is 64190872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24157225 + 3651921 = 4915^2 + 1911^2 .

It is not an unprimeable number, because it can be changed into a prime (27809149) 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 as a sum of consecutive naturals, namely, 6952285 + ... + 6952288.

Almost surely, 2^27809146 is an apocalyptic number.

27809146 is a deficient number, since it is larger than the sum of its proper divisors (13904576).

27809146 is a wasteful number, since it uses less digits than its factorization.

27809146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13904575.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 27809146 is about 5273.4377781481. The cubic root of 27809146 is about 302.9673889391.

The spelling of 27809146 in words is "twenty-seven million, eight hundred nine thousand, one hundred forty-six".