27942975 has 30 divisors (see below), whose sum is σ = 51763800. Its totient is φ = 14901840.

The previous prime is 27942877. The next prime is 27942989. The reversal of 27942975 is 57924972.

It is not a de Polignac number, because 27942975 - 2⁹ = 27942463 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 27942975.

It is a congruent number.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 4875 + ... + 8924.

It is an arithmetic number, because the mean of its divisors is an integer number (1725460).

Almost surely, 2^27942975 is an apocalyptic number.

27942975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27942975 is a deficient number, since it is larger than the sum of its proper divisors (23820825).

27942975 is a wasteful number, since it uses less digits than its factorization.

27942975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13821 (or 13807 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 27942975 is about 5286.1115198225. Note that the first 3 decimals coincide. The cubic root of 27942975 is about 303.4526124575.

The spelling of 27942975 in words is "twenty-seven million, nine hundred forty-two thousand, nine hundred seventy-five".