27931621798 has 8 divisors (see below), whose sum is σ = 43248962880. Its totient is φ = 13515300840.

The previous prime is 27931621777. The next prime is 27931621813. The reversal of 27931621798 is 89712613972.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225254953 + ... + 225255076.

It is an arithmetic number, because the mean of its divisors is an integer number (5406120360).

Almost surely, 2^27931621798 is an apocalyptic number.

27931621798 is a deficient number, since it is larger than the sum of its proper divisors (15317341082).

27931621798 is a wasteful number, since it uses less digits than its factorization.

27931621798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450510062.

The product of its digits is 2286144, while the sum is 55.

The spelling of 27931621798 in words is "twenty-seven billion, nine hundred thirty-one million, six hundred twenty-one thousand, seven hundred ninety-eight".