27728745045 has 32 divisors (see below), whose sum is σ = 44481830400. Its totient is φ = 14750114880.

The previous prime is 27728745043. The next prime is 27728745049. The reversal of 27728745045 is 54054782772.

It is a happy number.

It is not a de Polignac number, because 27728745045 - 2¹ = 27728745043 is a prime.

It is a super-2 number, since 2×27728745045² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728745041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13209406 + ... + 13211504.

It is an arithmetic number, because the mean of its divisors is an integer number (1390057200).

Almost surely, 2^27728745045 is an apocalyptic number.

It is an amenable number.

27728745045 is a deficient number, since it is larger than the sum of its proper divisors (16753085355).

27728745045 is a wasteful number, since it uses less digits than its factorization.

27728745045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985.

The product of its (nonzero) digits is 4390400, while the sum is 51.

The spelling of 27728745045 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-five thousand, forty-five".