27993281745 has 64 divisors (see below), whose sum is σ = 52850246400. Its totient is φ = 12473533440.

The previous prime is 27993281737. The next prime is 27993281773. The reversal of 27993281745 is 54718239972.

It is a happy number.

It is not a de Polignac number, because 27993281745 - 2³ = 27993281737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 462711 + ... + 519699.

It is an arithmetic number, because the mean of its divisors is an integer number (825785100).

Almost surely, 2^27993281745 is an apocalyptic number.

It is an amenable number.

27993281745 is a deficient number, since it is larger than the sum of its proper divisors (24856964655).

27993281745 is a wasteful number, since it uses less digits than its factorization.

27993281745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57250.

The product of its digits is 7620480, while the sum is 57.

The spelling of 27993281745 in words is "twenty-seven billion, nine hundred ninety-three million, two hundred eighty-one thousand, seven hundred forty-five".