19478278628 has 6 divisors (see below), whose sum is σ = 34086987606. Its totient is φ = 9739139312.

The previous prime is 19478278627. The next prime is 19478278669. The reversal of 19478278628 is 82687287491.

It can be written as a sum of positive squares in only one way, i.e., 16868294884 + 2609983744 = 129878^2 + 51088^2 .

It is not an unprimeable number, because it can be changed into a prime (19478278627) 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 as a sum of consecutive naturals, namely, 2434784825 + ... + 2434784832.

It is an arithmetic number, because the mean of its divisors is an integer number (5681164601).

Almost surely, 2^19478278628 is an apocalyptic number.

It is an amenable number.

19478278628 is a deficient number, since it is larger than the sum of its proper divisors (14608708978).

19478278628 is a wasteful number, since it uses less digits than its factorization.

19478278628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869569661 (or 4869569659 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 62.

The spelling of 19478278628 in words is "nineteen billion, four hundred seventy-eight million, two hundred seventy-eight thousand, six hundred twenty-eight".