19991632728888 has 96 divisors (see below), whose sum is σ = 54180100260000. Its totient is φ = 6659436720384.

The previous prime is 19991632728877. The next prime is 19991632728967. The reversal of 19991632728888 is 88882723619991.

19991632728888 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 1 + 6 + 327 + 288 + 8 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 745581370 + ... + 745608182.

It is an arithmetic number, because the mean of its divisors is an integer number (564376044375).

Almost surely, 2^{19991632728888} is an apocalyptic number.

19991632728888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19991632728888 is an abundant number, since it is smaller than the sum of its proper divisors (34188467531112).

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

19991632728888 is a wasteful number, since it uses less digits than its factorization.

19991632728888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33341 (or 33334 counting only the distinct ones).

The product of its digits is 1504935936, while the sum is 81.

The spelling of 19991632728888 in words is "nineteen trillion, nine hundred ninety-one billion, six hundred thirty-two million, seven hundred twenty-eight thousand, eight hundred eighty-eight".