27728587647 has 24 divisors (see below), whose sum is σ = 43208599824. Its totient is φ = 17070054144.

The previous prime is 27728587589. The next prime is 27728587657. The reversal of 27728587647 is 74678582772.

It is a happy number.

27728587647 is a `hidden beast` number, since 2 + 7 + 7 + 2 + 8 + 587 + 6 + 47 = 666.

It is not a de Polignac number, because 27728587647 - 2¹⁴ = 27728571263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728587657) 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, 1701633 + ... + 1717850.

It is an arithmetic number, because the mean of its divisors is an integer number (1800358326).

Almost surely, 2^27728587647 is an apocalyptic number.

27728587647 is a deficient number, since it is larger than the sum of its proper divisors (15480012177).

27728587647 is a wasteful number, since it uses less digits than its factorization.

27728587647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419559 (or 3419556 counting only the distinct ones).

The product of its digits is 73758720, while the sum is 63.

The spelling of 27728587647 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, six hundred forty-seven".