27984645 has 24 divisors (see below), whose sum is σ = 52239096. Its totient is φ = 13776768.

The previous prime is 27984643. The next prime is 27984647. The reversal of 27984645 is 54648972.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27984643) and next prime (27984647).

It can be written as a sum of positive squares in 4 ways, for example, as 42849 + 27941796 = 207^2 + 5286^2 .

It is not a de Polignac number, because 27984645 - 2¹ = 27984643 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 27984645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27984641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23334 + ... + 24503.

It is an arithmetic number, because the mean of its divisors is an integer number (2176629).

Almost surely, 2^27984645 is an apocalyptic number.

It is an amenable number.

27984645 is a deficient number, since it is larger than the sum of its proper divisors (24254451).

27984645 is a wasteful number, since it uses less digits than its factorization.

27984645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47861 (or 47858 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 27984645 is about 5290.0515120365. The cubic root of 27984645 is about 303.6033789143.

The spelling of 27984645 in words is "twenty-seven million, nine hundred eighty-four thousand, six hundred forty-five".