27720656 has 20 divisors (see below), whose sum is σ = 54014400. Its totient is φ = 13781472.

The previous prime is 27720617. The next prime is 27720661. The reversal of 27720656 is 65602772.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976 + ... + 7703.

It is an arithmetic number, because the mean of its divisors is an integer number (2700720).

Almost surely, 2^27720656 is an apocalyptic number.

It is an amenable number.

27720656 is a deficient number, since it is larger than the sum of its proper divisors (26293744).

27720656 is a wasteful number, since it uses less digits than its factorization.

27720656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9866 (or 9860 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 27720656 is about 5265.0409305152. The cubic root of 27720656 is about 302.6456953606.

The spelling of 27720656 in words is "twenty-seven million, seven hundred twenty thousand, six hundred fifty-six".