81874312388 has 12 divisors (see below), whose sum is σ = 156305505552. Its totient is φ = 37215596520.

The previous prime is 81874312349. The next prime is 81874312393. The reversal of 81874312388 is 88321347818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930389870 + ... + 930389957.

It is an arithmetic number, because the mean of its divisors is an integer number (13025458796).

Almost surely, 2^81874312388 is an apocalyptic number.

It is an amenable number.

81874312388 is a deficient number, since it is larger than the sum of its proper divisors (74431193164).

81874312388 is a wasteful number, since it uses less digits than its factorization.

81874312388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860779842 (or 1860779840 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The spelling of 81874312388 in words is "eighty-one billion, eight hundred seventy-four million, three hundred twelve thousand, three hundred eighty-eight".