27894668519538 has 42 divisors (see below), whose sum is σ = 62734759501599. Its totient is φ = 9298155616812.

The previous prime is 27894668519537. The next prime is 27894668519551. The reversal of 27894668519538 is 83591586649872.

27894668519538 is a `hidden beast` number, since 2 + 7 + 8 + 9 + 4 + 6 + 68 + 5 + 19 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13947334259769 + 13947334259769 = 3734613^2 + 3734613^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3734613.

It is a super-2 number, since 2×27894668519538² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (27894668519537) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 201599943 + ... + 201738261.

Almost surely, 2^{27894668519538} is an apocalyptic number.

27894668519538 is an abundant number, since it is smaller than the sum of its proper divisors (34840090982061).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27894668519538 is an frugal number, since it uses more digits than its factorization.

27894668519538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276658 (or 138324 counting only the distinct ones).

The product of its digits is 6270566400, while the sum is 81.

The spelling of 27894668519538 in words is "twenty-seven trillion, eight hundred ninety-four billion, six hundred sixty-eight million, five hundred nineteen thousand, five hundred thirty-eight".