27681307838 has 16 divisors (see below), whose sum is σ = 41908792176. Its totient is φ = 13711824000.

The previous prime is 27681307837. The next prime is 27681307861. The reversal of 27681307838 is 83870318672.

It is a self number, because there is not a number n which added to its sum of digits gives 27681307838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27681307837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481520 + ... + 535932.

It is an arithmetic number, because the mean of its divisors is an integer number (2619299511).

Almost surely, 2^27681307838 is an apocalyptic number.

27681307838 is a deficient number, since it is larger than the sum of its proper divisors (14227484338).

27681307838 is a wasteful number, since it uses less digits than its factorization.

27681307838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56779.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 27681307838 in words is "twenty-seven billion, six hundred eighty-one million, three hundred seven thousand, eight hundred thirty-eight".