128756250 has 192 divisors, whose sum is σ = 412473600. Its totient is φ = 29160000.

The previous prime is 128756191. The next prime is 128756261. The reversal of 128756250 is 52657821.

It is a happy number.

128756250 is a `hidden beast` number, since 1 + 28 + 7 + 5 + 625 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1181196 + ... + 1181304.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^128756250 is an apocalyptic number.

128756250 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 128756250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206236800).

128756250 is an abundant number, since it is smaller than the sum of its proper divisors (283717350).

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

128756250 is an equidigital number, since it uses as much as digits as its factorization.

128756250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 128756250 is about 11347.0811224737. The cubic root of 128756250 is about 504.9589876180.

The spelling of 128756250 in words is "one hundred twenty-eight million, seven hundred fifty-six thousand, two hundred fifty".