27391477680 has 240 divisors, whose sum is σ = 110664702720. Its totient is φ = 5931366912.

The previous prime is 27391477651. The next prime is 27391477697. The reversal of 27391477680 is 8677419372.

27391477680 is a `hidden beast` number, since 2 + 7 + 3 + 91 + 477 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47262 + ... + 238781.

It is an arithmetic number, because the mean of its divisors is an integer number (461102928).

Almost surely, 2^27391477680 is an apocalyptic number.

27391477680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27391477680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55332351360).

27391477680 is an abundant number, since it is smaller than the sum of its proper divisors (83273225040).

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

27391477680 is a wasteful number, since it uses less digits than its factorization.

27391477680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286088 (or 286079 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 27391477680 in words is "twenty-seven billion, three hundred ninety-one million, four hundred seventy-seven thousand, six hundred eighty".