27691785216 has 132 divisors (see below), whose sum is σ = 80085910944. Its totient is φ = 9216000000.

The previous prime is 27691785211. The next prime is 27691785223. The reversal of 27691785216 is 61258719672.

27691785216 is a `hidden beast` number, since 27 + 6 + 91 + 7 + 8 + 521 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27691785211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6919216 + ... + 6923216.

Almost surely, 2^27691785216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27691785216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40042955472).

27691785216 is an abundant number, since it is smaller than the sum of its proper divisors (52394125728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27691785216 is a wasteful number, since it uses less digits than its factorization.

27691785216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4757 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 27691785216 in words is "twenty-seven billion, six hundred ninety-one million, seven hundred eighty-five thousand, two hundred sixteen".