27709728 has 48 divisors (see below), whose sum is σ = 77021280. Its totient is φ = 8692736.

The previous prime is 27709723. The next prime is 27709751. The reversal of 27709728 is 82790772.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 27709728.

It is not an unprimeable number, because it can be changed into a prime (27709723) 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, 6858 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (1604610).

Almost surely, 2^27709728 is an apocalyptic number.

It is an amenable number.

27709728 is an abundant number, since it is smaller than the sum of its proper divisors (49311552).

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

27709728 is a wasteful number, since it uses less digits than its factorization.

27709728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17009 (or 17001 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 27709728 is about 5264.0030395128. The cubic root of 27709728 is about 302.6059206062.

The spelling of 27709728 in words is "twenty-seven million, seven hundred nine thousand, seven hundred twenty-eight".