27747728 has 40 divisors (see below), whose sum is σ = 56829696. Its totient is φ = 13104000.

The previous prime is 27747721. The next prime is 27747749. The reversal of 27747728 is 82774772.

It is not an unprimeable number, because it can be changed into a prime (27747721) 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, 20678 + ... + 21978.

Almost surely, 2^27747728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27747728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28414848).

27747728 is an abundant number, since it is smaller than the sum of its proper divisors (29081968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27747728 is a wasteful number, since it uses less digits than its factorization.

27747728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1377 counting only the distinct ones).

The product of its digits is 307328, while the sum is 44.

The square root of 27747728 is about 5267.6112233156. The cubic root of 27747728 is about 302.7441845948.

The spelling of 27747728 in words is "twenty-seven million, seven hundred forty-seven thousand, seven hundred twenty-eight".