27934442978 has 18 divisors (see below), whose sum is σ = 45377799777. Its totient is φ = 12891401640.

The previous prime is 27934442951. The next prime is 27934442983. The reversal of 27934442978 is 87924443972.

It can be written as a sum of positive squares in 2 ways, for example, as 23884775209 + 4049667769 = 154547^2 + 63637^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118183.

It is a super-2 number, since 2×27934442978² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3068213 + ... + 3077303.

Almost surely, 2^27934442978 is an apocalyptic number.

27934442978 is a deficient number, since it is larger than the sum of its proper divisors (17443356799).

27934442978 is an frugal number, since it uses more digits than its factorization.

27934442978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18210 (or 9106 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 59.

The spelling of 27934442978 in words is "twenty-seven billion, nine hundred thirty-four million, four hundred forty-two thousand, nine hundred seventy-eight".