27656645 has 8 divisors (see below), whose sum is σ = 33380856. Its totient is φ = 21996736.

The previous prime is 27656641. The next prime is 27656659. The reversal of 27656645 is 54665672.

It can be written as a sum of positive squares in 4 ways, for example, as 15864289 + 11792356 = 3983^2 + 3434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27656645 - 2² = 27656641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27656641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15122 + ... + 16851.

It is an arithmetic number, because the mean of its divisors is an integer number (4172607).

Almost surely, 2^27656645 is an apocalyptic number.

It is an amenable number.

27656645 is a deficient number, since it is larger than the sum of its proper divisors (5724211).

27656645 is a wasteful number, since it uses less digits than its factorization.

27656645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32151.

The product of its digits is 302400, while the sum is 41.

The square root of 27656645 is about 5258.9585470890. The cubic root of 27656645 is about 302.4125649448.

The spelling of 27656645 in words is "twenty-seven million, six hundred fifty-six thousand, six hundred forty-five".