27640127645 has 16 divisors (see below), whose sum is σ = 35739688320. Its totient is φ = 20399663424.

The previous prime is 27640127639. The next prime is 27640127693. The reversal of 27640127645 is 54672104672.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27640127645 - 2²² = 27635933341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27640127596 and 27640127605.

It is a congruent 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, 2825 + ... + 235134.

It is an arithmetic number, because the mean of its divisors is an integer number (2233730520).

Almost surely, 2^27640127645 is an apocalyptic number.

It is an amenable number.

27640127645 is a deficient number, since it is larger than the sum of its proper divisors (8099560675).

27640127645 is a wasteful number, since it uses less digits than its factorization.

27640127645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239764.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 27640127645 in words is "twenty-seven billion, six hundred forty million, one hundred twenty-seven thousand, six hundred forty-five".