27947745 has 72 divisors (see below), whose sum is σ = 59002944. Its totient is φ = 11985408.

The previous prime is 27947743. The next prime is 27947749. The reversal of 27947745 is 54774972.

It is not a de Polignac number, because 27947745 - 2¹ = 27947743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 27947745.

It is not an unprimeable number, because it can be changed into a prime (27947743) 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 in 71 ways as a sum of consecutive naturals, for example, 90882 + ... + 91188.

Almost surely, 2^27947745 is an apocalyptic number.

It is an amenable number.

27947745 is an abundant number, since it is smaller than the sum of its proper divisors (31055199).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27947745 is a wasteful number, since it uses less digits than its factorization.

27947745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 339 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 27947745 is about 5286.5626828782. The cubic root of 27947745 is about 303.4698784144.

The spelling of 27947745 in words is "twenty-seven million, nine hundred forty-seven thousand, seven hundred forty-five".