27728782145 has 16 divisors (see below), whose sum is σ = 33389575488. Its totient is φ = 22106410560.

The previous prime is 27728782049. The next prime is 27728782219. The reversal of 27728782145 is 54128782772.

It is a happy number.

It is not a de Polignac number, because 27728782145 - 2¹⁰ = 27728781121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4058222 + ... + 4065048.

It is an arithmetic number, because the mean of its divisors is an integer number (2086848468).

Almost surely, 2^27728782145 is an apocalyptic number.

It is an amenable number.

27728782145 is a deficient number, since it is larger than the sum of its proper divisors (5660793343).

27728782145 is a wasteful number, since it uses less digits than its factorization.

27728782145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520.

The product of its digits is 3512320, while the sum is 53.

The spelling of 27728782145 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred eighty-two thousand, one hundred forty-five".