38646513728 has 28 divisors (see below), whose sum is σ = 76699506240. Its totient is φ = 19320653952.

The previous prime is 38646513707. The next prime is 38646513733. The reversal of 38646513728 is 82731564683.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 38646513728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492293 + ... + 565371.

It is an arithmetic number, because the mean of its divisors is an integer number (2739268080).

Almost surely, 2^38646513728 is an apocalyptic number.

It is an amenable number.

38646513728 is a deficient number, since it is larger than the sum of its proper divisors (38052992512).

38646513728 is an equidigital number, since it uses as much as digits as its factorization.

38646513728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81354 (or 81344 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The spelling of 38646513728 in words is "thirty-eight billion, six hundred forty-six million, five hundred thirteen thousand, seven hundred twenty-eight".