128688750 has 200 divisors, whose sum is σ = 381028032. Its totient is φ = 32400000.

The previous prime is 128688743. The next prime is 128688751. The reversal of 128688750 is 57886821.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 128688696 and 128688705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128688751) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 3138730 + ... + 3138770.

Almost surely, 2^128688750 is an apocalyptic number.

128688750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128688750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190514016).

128688750 is an abundant number, since it is smaller than the sum of its proper divisors (252339282).

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

128688750 is an equidigital number, since it uses as much as digits as its factorization.

128688750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 128688750 is about 11344.1063993600. The cubic root of 128688750 is about 504.8707312170.

The spelling of 128688750 in words is "one hundred twenty-eight million, six hundred eighty-eight thousand, seven hundred fifty".