27728587645 has 8 divisors (see below), whose sum is σ = 36299242080. Its totient is φ = 20166245520.

The previous prime is 27728587589. The next prime is 27728587657. The reversal of 27728587645 is 54678582772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27728587645 - 2¹⁹ = 27728063357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252078015 + ... + 252078124.

It is an arithmetic number, because the mean of its divisors is an integer number (4537405260).

Almost surely, 2^27728587645 is an apocalyptic number.

It is an amenable number.

27728587645 is a deficient number, since it is larger than the sum of its proper divisors (8570654435).

27728587645 is a wasteful number, since it uses less digits than its factorization.

27728587645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504156155.

The product of its digits is 52684800, while the sum is 61.

The spelling of 27728587645 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, six hundred forty-five".