19128577840 has 20 divisors (see below), whose sum is σ = 44473943664. Its totient is φ = 7651431104.

The previous prime is 19128577763. The next prime is 19128577843. The reversal of 19128577840 is 4877582191.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (19128577843) by changing a digit.

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, 119553532 + ... + 119553691.

Almost surely, 2^19128577840 is an apocalyptic number.

19128577840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19128577840 is an abundant number, since it is smaller than the sum of its proper divisors (25345365824).

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

19128577840 is a wasteful number, since it uses less digits than its factorization.

19128577840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239107236 (or 239107230 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 19128577840 in words is "nineteen billion, one hundred twenty-eight million, five hundred seventy-seven thousand, eight hundred forty".