128749857936 has 80 divisors (see below), whose sum is σ = 382316018304. Its totient is φ = 36573023232.

The previous prime is 128749857889. The next prime is 128749857937. The reversal of 128749857936 is 639758947821.

It is not an unprimeable number, because it can be changed into a prime (128749857937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1049341 + ... + 1165596.

Almost surely, 2^128749857936 is an apocalyptic number.

128749857936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128749857936 is an abundant number, since it is smaller than the sum of its proper divisors (253566160368).

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

128749857936 is a wasteful number, since it uses less digits than its factorization.

128749857936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215128 (or 2215122 counting only the distinct ones).

The product of its digits is 182891520, while the sum is 69.

The spelling of 128749857936 in words is "one hundred twenty-eight billion, seven hundred forty-nine million, eight hundred fifty-seven thousand, nine hundred thirty-six".