27726561 has 6 divisors (see below), whose sum is σ = 40049490. Its totient is φ = 18484368.

The previous prime is 27726557. The next prime is 27726593. The reversal of 27726561 is 16562772.

27726561 is a `hidden beast` number, since 2 + 77 + 26 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 9960336 = 4215^2 + 3156^2 .

It is not a de Polignac number, because 27726561 - 2² = 27726557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27726761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1540356 + ... + 1540373.

It is an arithmetic number, because the mean of its divisors is an integer number (6674915).

Almost surely, 2^27726561 is an apocalyptic number.

It is an amenable number.

27726561 is a deficient number, since it is larger than the sum of its proper divisors (12322929).

27726561 is a wasteful number, since it uses less digits than its factorization.

27726561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080735 (or 3080732 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 27726561 is about 5265.6016750225. The cubic root of 27726561 is about 302.6671834999.

The spelling of 27726561 in words is "twenty-seven million, seven hundred twenty-six thousand, five hundred sixty-one".