27128506 has 4 divisors (see below), whose sum is σ = 40692762. Its totient is φ = 13564252.

The previous prime is 27128473. The next prime is 27128531. The reversal of 27128506 is 60582172.

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., 27092025 + 36481 = 5205^2 + 191^2 .

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 polite number, since it can be written as a sum of consecutive naturals, namely, 6782125 + ... + 6782128.

Almost surely, 2^27128506 is an apocalyptic number.

27128506 is a deficient number, since it is larger than the sum of its proper divisors (13564256).

27128506 is a wasteful number, since it uses less digits than its factorization.

27128506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13564255.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 27128506 is about 5208.5032398953. The cubic root of 27128506 is about 300.4751950496.

The spelling of 27128506 in words is "twenty-seven million, one hundred twenty-eight thousand, five hundred six".