128768564287138 has 8 divisors (see below), whose sum is σ = 193153136712732. Its totient is φ = 64384185382896.

The previous prime is 128768564287127. The next prime is 128768564287219. The reversal of 128768564287138 is 831782465867821.

It can be written as a sum of positive squares in 2 ways, for example, as 128321159819449 + 447404467689 = 11327893^2 + 668883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×128768564287138² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46705245 + ... + 49385392.

Almost surely, 2^{128768564287138} is an apocalyptic number.

128768564287138 is a deficient number, since it is larger than the sum of its proper divisors (64384572425594).

128768564287138 is an equidigital number, since it uses as much as digits as its factorization.

128768564287138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96760676.

The product of its digits is 1734082560, while the sum is 76.

The spelling of 128768564287138 in words is "one hundred twenty-eight trillion, seven hundred sixty-eight billion, five hundred sixty-four million, two hundred eighty-seven thousand, one hundred thirty-eight".