27878455857 has 16 divisors (see below), whose sum is σ = 42694937600. Its totient is φ = 15850490832.

The previous prime is 27878455819. The next prime is 27878455867. The reversal of 27878455857 is 75855487872.

It is not a de Polignac number, because 27878455857 - 2⁷ = 27878455729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27878455867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3331363 + ... + 3339720.

It is an arithmetic number, because the mean of its divisors is an integer number (2668433600).

Almost surely, 2^27878455857 is an apocalyptic number.

It is an amenable number.

27878455857 is a deficient number, since it is larger than the sum of its proper divisors (14816481743).

27878455857 is a wasteful number, since it uses less digits than its factorization.

27878455857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671292.

The product of its digits is 175616000, while the sum is 66.

The spelling of 27878455857 in words is "twenty-seven billion, eight hundred seventy-eight million, four hundred fifty-five thousand, eight hundred fifty-seven".