128278157456856 has 64 divisors (see below), whose sum is σ = 350342961638400. Its totient is φ = 38817342115200.

The previous prime is 128278157456783. The next prime is 128278157456857. The reversal of 128278157456856 is 658654751872821.

It is a super-3 number, since 3×128278157456856³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128278157456857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342480040 + ... + 342854391.

It is an arithmetic number, because the mean of its divisors is an integer number (5474108775600).

Almost surely, 2^{128278157456856} is an apocalyptic number.

It is an amenable number.

128278157456856 is an abundant number, since it is smaller than the sum of its proper divisors (222064804181544).

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

128278157456856 is a wasteful number, since it uses less digits than its factorization.

128278157456856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685335160 (or 685335156 counting only the distinct ones).

The product of its digits is 1806336000, while the sum is 75.

The spelling of 128278157456856 in words is "one hundred twenty-eight trillion, two hundred seventy-eight billion, one hundred fifty-seven million, four hundred fifty-six thousand, eight hundred fifty-six".