27257728 has 32 divisors (see below), whose sum is σ = 55208520. Its totient is φ = 13401600.

The previous prime is 27257693. The next prime is 27257729. The reversal of 27257728 is 82775272.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27257729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6063 + ... + 9553.

Almost surely, 2^27257728 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 27257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27604260).

27257728 is an abundant number, since it is smaller than the sum of its proper divisors (27950792).

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

27257728 is an equidigital number, since it uses as much as digits as its factorization.

27257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566 (or 3554 counting only the distinct ones).

The product of its digits is 109760, while the sum is 40.

The square root of 27257728 is about 5220.8934101359. The cubic root of 27257728 is about 300.9515269456.

The spelling of 27257728 in words is "twenty-seven million, two hundred fifty-seven thousand, seven hundred twenty-eight".