27428985 has 12 divisors (see below), whose sum is σ = 47543652. Its totient is φ = 14628768.

The previous prime is 27428971. The next prime is 27428987. The reversal of 27428985 is 58982472.

It can be written as a sum of positive squares in 2 ways, for example, as 15896169 + 11532816 = 3987^2 + 3396^2 .

It is not a de Polignac number, because 27428985 - 2⁵ = 27428953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 609533 = 27428985 / (2 + 7 + 4 + 2 + 8 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27428985.

It is not an unprimeable number, because it can be changed into a prime (27428987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304722 + ... + 304811.

It is an arithmetic number, because the mean of its divisors is an integer number (3961971).

Almost surely, 2^27428985 is an apocalyptic number.

It is an amenable number.

27428985 is a deficient number, since it is larger than the sum of its proper divisors (20114667).

27428985 is a wasteful number, since it uses less digits than its factorization.

27428985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609544 (or 609541 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 27428985 is about 5237.2688493145. The cubic root of 27428985 is about 301.5804921925.

The spelling of 27428985 in words is "twenty-seven million, four hundred twenty-eight thousand, nine hundred eighty-five".