19616243728 has 10 divisors (see below), whose sum is σ = 38006472254. Its totient is φ = 9808121856.

The previous prime is 19616243723. The next prime is 19616243741. The reversal of 19616243728 is 82734261691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18986635264 + 629608464 = 137792^2 + 25092^2 .

It is not an unprimeable number, because it can be changed into a prime (19616243723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613007601 + ... + 613007632.

Almost surely, 2^19616243728 is an apocalyptic number.

It is an amenable number.

19616243728 is a deficient number, since it is larger than the sum of its proper divisors (18390228526).

19616243728 is a wasteful number, since it uses less digits than its factorization.

19616243728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226015241 (or 1226015235 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The spelling of 19616243728 in words is "nineteen billion, six hundred sixteen million, two hundred forty-three thousand, seven hundred twenty-eight".