19886537928 has 16 divisors (see below), whose sum is σ = 49716344880. Its totient is φ = 6628845968.

The previous prime is 19886537927. The next prime is 19886537953. The reversal of 19886537928 is 82973568891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19886537927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414302850 + ... + 414302897.

It is an arithmetic number, because the mean of its divisors is an integer number (3107271555).

Almost surely, 2^19886537928 is an apocalyptic number.

It is an amenable number.

19886537928 is an abundant number, since it is smaller than the sum of its proper divisors (29829806952).

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

19886537928 is a wasteful number, since it uses less digits than its factorization.

19886537928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828605756 (or 828605752 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 66.

The spelling of 19886537928 in words is "nineteen billion, eight hundred eighty-six million, five hundred thirty-seven thousand, nine hundred twenty-eight".