27638649 has 6 divisors (see below), whose sum is σ = 39922506. Its totient is φ = 18425760.

The previous prime is 27638647. The next prime is 27638657. The reversal of 27638649 is 94683672.

27638649 is a `hidden beast` number, since 2 + 7 + 638 + 6 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23765625 + 3873024 = 4875^2 + 1968^2 .

It is not a de Polignac number, because 27638649 - 2¹ = 27638647 is a prime.

It is a super-3 number, since 3×27638649³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (27638641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1535472 + ... + 1535489.

It is an arithmetic number, because the mean of its divisors is an integer number (6653751).

Almost surely, 2^27638649 is an apocalyptic number.

It is an amenable number.

27638649 is a deficient number, since it is larger than the sum of its proper divisors (12283857).

27638649 is a wasteful number, since it uses less digits than its factorization.

27638649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070967 (or 3070964 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 27638649 is about 5257.2472835125. The cubic root of 27638649 is about 302.3469580795.

The spelling of 27638649 in words is "twenty-seven million, six hundred thirty-eight thousand, six hundred forty-nine".