27129645 has 24 divisors (see below), whose sum is σ = 48648600. Its totient is φ = 13969536.

The previous prime is 27129631. The next prime is 27129649. The reversal of 27129645 is 54692172.

27129645 is a `hidden beast` number, since 2 + 7 + 1 + 2 + 9 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7469289 + 19660356 = 2733^2 + 4434^2 .

It is not a de Polignac number, because 27129645 - 2¹³ = 27121453 is a prime.

It is a super-3 number, since 3×27129645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27129649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9090 + ... + 11699.

It is an arithmetic number, because the mean of its divisors is an integer number (2027025).

Almost surely, 2^27129645 is an apocalyptic number.

It is an amenable number.

27129645 is a deficient number, since it is larger than the sum of its proper divisors (21518955).

27129645 is a wasteful number, since it uses less digits than its factorization.

27129645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20829 (or 20826 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 27129645 is about 5208.6125791808. The cubic root of 27129645 is about 300.4794001768.

The spelling of 27129645 in words is "twenty-seven million, one hundred twenty-nine thousand, six hundred forty-five".