27804518865 has 80 divisors (see below), whose sum is σ = 50627174400. Its totient is φ = 14596702848.

The previous prime is 27804518837. The next prime is 27804518869. The reversal of 27804518865 is 56881540872.

It is not a de Polignac number, because 27804518865 - 2⁶ = 27804518801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27804518869) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12252951 + ... + 12255219.

It is an arithmetic number, because the mean of its divisors is an integer number (632839680).

Almost surely, 2^27804518865 is an apocalyptic number.

It is an amenable number.

27804518865 is a deficient number, since it is larger than the sum of its proper divisors (22822655535).

27804518865 is a wasteful number, since it uses less digits than its factorization.

27804518865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748 (or 2739 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 27804518865 in words is "twenty-seven billion, eight hundred four million, five hundred eighteen thousand, eight hundred sixty-five".