128788074987256 has 32 divisors (see below), whose sum is σ = 244532380538880. Its totient is φ = 63584547372000.

The previous prime is 128788074987251. The next prime is 128788074987259. The reversal of 128788074987256 is 652789470887821.

It is a self number, because there is not a number n which added to its sum of digits gives 128788074987256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128788074987251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318997800 + ... + 319401271.

It is an arithmetic number, because the mean of its divisors is an integer number (7641636891840).

Almost surely, 2^{128788074987256} is an apocalyptic number.

It is an amenable number.

128788074987256 is a deficient number, since it is larger than the sum of its proper divisors (115744305551624).

128788074987256 is a wasteful number, since it uses less digits than its factorization.

128788074987256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638399395 (or 638399391 counting only the distinct ones).

The product of its (nonzero) digits is 6069288960, while the sum is 82.

The spelling of 128788074987256 in words is "one hundred twenty-eight trillion, seven hundred eighty-eight billion, seventy-four million, nine hundred eighty-seven thousand, two hundred fifty-six".