27690145 has 12 divisors (see below), whose sum is σ = 38653524. Its totient is φ = 18987360.

The previous prime is 27690139. The next prime is 27690149. The reversal of 27690145 is 54109672.

It can be written as a sum of positive squares in 2 ways, for example, as 15586704 + 12103441 = 3948^2 + 3479^2 .

It is a de Polignac number, because none of the positive numbers 2^k-27690145 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 27690145.

It is not an unprimeable number, because it can be changed into a prime (27690149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56266 + ... + 56755.

It is an arithmetic number, because the mean of its divisors is an integer number (3221127).

Almost surely, 2^27690145 is an apocalyptic number.

It is an amenable number.

27690145 is a deficient number, since it is larger than the sum of its proper divisors (10963379).

27690145 is a wasteful number, since it uses less digits than its factorization.

27690145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113040 (or 113033 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 27690145 is about 5262.1426244449. The cubic root of 27690145 is about 302.5346179902.

The spelling of 27690145 in words is "twenty-seven million, six hundred ninety thousand, one hundred forty-five".