38091778669728 has 72 divisors (see below), whose sum is σ = 123798280683168. Its totient is φ = 10883365333632.

The previous prime is 38091778669709. The next prime is 38091778669741. The reversal of 38091778669728 is 82796687719083.

38091778669728 is a `hidden beast` number, since 380 + 9 + 1 + 7 + 78 + 66 + 97 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9447363726 + ... + 9447367757.

It is an arithmetic number, because the mean of its divisors is an integer number (1719420565044).

Almost surely, 2^{38091778669728} is an apocalyptic number.

It is an amenable number.

38091778669728 is an abundant number, since it is smaller than the sum of its proper divisors (85706502013440).

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

38091778669728 is a wasteful number, since it uses less digits than its factorization.

38091778669728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18894731506 (or 18894731495 counting only the distinct ones).

The product of its (nonzero) digits is 3072577536, while the sum is 81.

The spelling of 38091778669728 in words is "thirty-eight trillion, ninety-one billion, seven hundred seventy-eight million, six hundred sixty-nine thousand, seven hundred twenty-eight".