27748471057 has 4 divisors (see below), whose sum is σ = 28425263076. Its totient is φ = 27071679040.

The previous prime is 27748471019. The next prime is 27748471067. The reversal of 27748471057 is 75017484772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11593044241 + 16155426816 = 107671^2 + 127104^2 .

It is a cyclic number.

It is not a de Polignac number, because 27748471057 - 2⁷ = 27748470929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27748470995 and 27748471013.

It is not an unprimeable number, because it can be changed into a prime (27748471067) 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, 338395948 + ... + 338396029.

It is an arithmetic number, because the mean of its divisors is an integer number (7106315769).

Almost surely, 2^27748471057 is an apocalyptic number.

It is an amenable number.

27748471057 is a deficient number, since it is larger than the sum of its proper divisors (676792019).

27748471057 is an equidigital number, since it uses as much as digits as its factorization.

27748471057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676792018.

The product of its (nonzero) digits is 3073280, while the sum is 52.

The spelling of 27748471057 in words is "twenty-seven billion, seven hundred forty-eight million, four hundred seventy-one thousand, fifty-seven".