27728447 has 8 divisors (see below), whose sum is σ = 28184640. Its totient is φ = 27275040.

The previous prime is 27728431. The next prime is 27728473. The reversal of 27728447 is 74482772.

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 27728447 - 2⁴ = 27728431 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 (27728417) 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, 28997 + ... + 29937.

It is an arithmetic number, because the mean of its divisors is an integer number (3523080).

Almost surely, 2^27728447 is an apocalyptic number.

27728447 is a deficient number, since it is larger than the sum of its proper divisors (456193).

27728447 is an equidigital number, since it uses as much as digits as its factorization.

27728447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its digits is 175616, while the sum is 41.

The square root of 27728447 is about 5265.7807588239. The cubic root of 27728447 is about 302.6740459613.

The spelling of 27728447 in words is "twenty-seven million, seven hundred twenty-eight thousand, four hundred forty-seven".