27888642 has 12 divisors (see below), whose sum is σ = 60425430. Its totient is φ = 9296208.

The previous prime is 27888629. The next prime is 27888647. The reversal of 27888642 is 24688872.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20711601 + 7177041 = 4551^2 + 2679^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (27888647) 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, 774667 + ... + 774702.

Almost surely, 2^27888642 is an apocalyptic number.

27888642 is an abundant number, since it is smaller than the sum of its proper divisors (32536788).

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

27888642 is a wasteful number, since it uses less digits than its factorization.

27888642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549377 (or 1549374 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 27888642 is about 5280.9697973005. The cubic root of 27888642 is about 303.2558046304.

The spelling of 27888642 in words is "twenty-seven million, eight hundred eighty-eight thousand, six hundred forty-two".