27806213745 has 24 divisors (see below), whose sum is σ = 50292979776. Its totient is φ = 14185198368.

The previous prime is 27806213737. The next prime is 27806213777. The reversal of 27806213745 is 54731260872.

27806213745 is a `hidden beast` number, since 278 + 0 + 6 + 2 + 1 + 374 + 5 = 666.

It is not a de Polignac number, because 27806213745 - 2³ = 27806213737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 27806213745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13431919 + ... + 13433988.

It is an arithmetic number, because the mean of its divisors is an integer number (2095540824).

Almost surely, 2^27806213745 is an apocalyptic number.

It is an amenable number.

27806213745 is a deficient number, since it is larger than the sum of its proper divisors (22486766031).

27806213745 is a wasteful number, since it uses less digits than its factorization.

27806213745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26865941 (or 26865938 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 27806213745 in words is "twenty-seven billion, eight hundred six million, two hundred thirteen thousand, seven hundred forty-five".