27728487 has 24 divisors (see below), whose sum is σ = 42339024. Its totient is φ = 18128448.

The previous prime is 27728473. The next prime is 27728509. The reversal of 27728487 is 78482772.

It is not a de Polignac number, because 27728487 - 2⁷ = 27728359 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 11803 + ... + 13955.

It is an arithmetic number, because the mean of its divisors is an integer number (1764126).

Almost surely, 2^27728487 is an apocalyptic number.

27728487 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

27728487 is a deficient number, since it is larger than the sum of its proper divisors (14610537).

27728487 is an equidigital number, since it uses as much as digits as its factorization.

27728487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221 (or 2209 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 27728487 is about 5265.7845569298. The cubic root of 27728487 is about 302.6741915032.

The spelling of 27728487 in words is "twenty-seven million, seven hundred twenty-eight thousand, four hundred eighty-seven".