27057481978 has 8 divisors (see below), whose sum is σ = 40613632020. Its totient is φ = 13519604640.

The previous prime is 27057481973. The next prime is 27057481993. The reversal of 27057481978 is 87918475072.

It can be written as a sum of positive squares in 2 ways, for example, as 27046104849 + 11377129 = 164457^2 + 3373^2 .

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

It is not an unprimeable number, because it can be changed into a prime (27057481973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4564473 + ... + 4570396.

Almost surely, 2^27057481978 is an apocalyptic number.

27057481978 is a deficient number, since it is larger than the sum of its proper divisors (13556150042).

27057481978 is a wasteful number, since it uses less digits than its factorization.

27057481978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9136352.

The product of its (nonzero) digits is 7902720, while the sum is 58.

The spelling of 27057481978 in words is "twenty-seven billion, fifty-seven million, four hundred eighty-one thousand, nine hundred seventy-eight".