19978250028 has 48 divisors (see below), whose sum is σ = 50863201536. Its totient is φ = 6052887360.

The previous prime is 19978250027. The next prime is 19978250029. The reversal of 19978250028 is 82005287991.

It is an interprime number because it is at equal distance from previous prime (19978250027) and next prime (19978250029).

It is not an unprimeable number, because it can be changed into a prime (19978250021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941625 + ... + 962607.

It is an arithmetic number, because the mean of its divisors is an integer number (1059650032).

Almost surely, 2^19978250028 is an apocalyptic number.

It is an amenable number.

19978250028 is an abundant number, since it is smaller than the sum of its proper divisors (30884951508).

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

19978250028 is a wasteful number, since it uses less digits than its factorization.

19978250028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28214 (or 28212 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 19978250028 in words is "nineteen billion, nine hundred seventy-eight million, two hundred fifty thousand, twenty-eight".