27806581242 has 48 divisors (see below), whose sum is σ = 66402266112. Its totient is φ = 8339362560.

The previous prime is 27806581217. The next prime is 27806581247. The reversal of 27806581242 is 24218560872.

27806581242 is a `hidden beast` number, since 27 + 8 + 0 + 6 + 581 + 2 + 42 = 666.

It is not an unprimeable number, because it can be changed into a prime (27806581247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 704698 + ... + 743109.

It is an arithmetic number, because the mean of its divisors is an integer number (1383380544).

Almost surely, 2^27806581242 is an apocalyptic number.

27806581242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

27806581242 is an abundant number, since it is smaller than the sum of its proper divisors (38595684870).

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

27806581242 is a wasteful number, since it uses less digits than its factorization.

27806581242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447923 (or 1447920 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 27806581242 in words is "twenty-seven billion, eight hundred six million, five hundred eighty-one thousand, two hundred forty-two".