27485781 has 16 divisors (see below), whose sum is σ = 37428480. Its totient is φ = 17937920.

The previous prime is 27485779. The next prime is 27485789. The reversal of 27485781 is 18758472.

It is a cyclic number.

It is not a de Polignac number, because 27485781 - 2¹ = 27485779 is a prime.

It is a super-2 number, since 2×27485781² = 1510936314359922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27485789) 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 15 ways as a sum of consecutive naturals, for example, 29716 + ... + 30626.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^27485781 is an apocalyptic number.

It is an amenable number.

27485781 is a deficient number, since it is larger than the sum of its proper divisors (9942699).

27485781 is a wasteful number, since it uses less digits than its factorization.

27485781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its digits is 125440, while the sum is 42.

The square root of 27485781 is about 5242.6883371034. The cubic root of 27485781 is about 301.7885051973.

The spelling of 27485781 in words is "twenty-seven million, four hundred eighty-five thousand, seven hundred eighty-one".