27840788945 has 16 divisors (see below), whose sum is σ = 34589322000. Its totient is φ = 21486974208.

The previous prime is 27840788933. The next prime is 27840788951. The reversal of 27840788945 is 54988704872.

It can be written as a sum of positive squares in 8 ways, for example, as 27888961 + 27812899984 = 5281^2 + 166772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27840788945 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100091 + ... + 256319.

It is an arithmetic number, because the mean of its divisors is an integer number (2161832625).

Almost surely, 2^27840788945 is an apocalyptic number.

It is an amenable number.

27840788945 is a deficient number, since it is larger than the sum of its proper divisors (6748533055).

27840788945 is a wasteful number, since it uses less digits than its factorization.

27840788945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157492.

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 27840788945 in words is "twenty-seven billion, eight hundred forty million, seven hundred eighty-eight thousand, nine hundred forty-five".