27931223808 has 108 divisors (see below), whose sum is σ = 80727596040. Its totient is φ = 9287866368.

The previous prime is 27931223783. The next prime is 27931223857. The reversal of 27931223808 is 80832213972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 950910 + ... + 979842.

Almost surely, 2^27931223808 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 27931223808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40363798020).

27931223808 is an abundant number, since it is smaller than the sum of its proper divisors (52796372232).

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

27931223808 is a wasteful number, since it uses less digits than its factorization.

27931223808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29374 (or 29357 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 27931223808 in words is "twenty-seven billion, nine hundred thirty-one million, two hundred twenty-three thousand, eight hundred eight".