27128649 has 16 divisors (see below), whose sum is σ = 36715392. Its totient is φ = 17816448.

The previous prime is 27128641. The next prime is 27128653. The reversal of 27128649 is 94682172.

It is not a de Polignac number, because 27128649 - 2³ = 27128641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27128641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86517 + ... + 86829.

It is an arithmetic number, because the mean of its divisors is an integer number (2294712).

Almost surely, 2^27128649 is an apocalyptic number.

It is an amenable number.

27128649 is a deficient number, since it is larger than the sum of its proper divisors (9586743).

27128649 is a wasteful number, since it uses less digits than its factorization.

27128649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656.

The product of its digits is 48384, while the sum is 39.

The square root of 27128649 is about 5208.5169674294. The cubic root of 27128649 is about 300.4757230044.

It can be divided in two parts, 271 and 28649, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 27128649 in words is "twenty-seven million, one hundred twenty-eight thousand, six hundred forty-nine".