19877889881928 has 64 divisors (see below), whose sum is σ = 53530138569600. Its totient is φ = 6114817497600.

The previous prime is 19877889881891. The next prime is 19877889881953. The reversal of 19877889881928 is 82918898877891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6272148 + ... + 8893571.

It is an arithmetic number, because the mean of its divisors is an integer number (836408415150).

Almost surely, 2^{19877889881928} is an apocalyptic number.

It is an amenable number.

19877889881928 is an abundant number, since it is smaller than the sum of its proper divisors (33652248687672).

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

19877889881928 is a wasteful number, since it uses less digits than its factorization.

19877889881928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15169942 (or 15169938 counting only the distinct ones).

The product of its digits is 18728091648, while the sum is 93.

The spelling of 19877889881928 in words is "nineteen trillion, eight hundred seventy-seven billion, eight hundred eighty-nine million, eight hundred eighty-one thousand, nine hundred twenty-eight".