128512750 has 16 divisors (see below), whose sum is σ = 240576336. Its totient is φ = 51405000.

The previous prime is 128512733. The next prime is 128512759. The reversal of 128512750 is 57215821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128512759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256776 + ... + 257275.

It is an arithmetic number, because the mean of its divisors is an integer number (15036021).

Almost surely, 2^128512750 is an apocalyptic number.

128512750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128512750 is a deficient number, since it is larger than the sum of its proper divisors (112063586).

128512750 is an equidigital number, since it uses as much as digits as its factorization.

128512750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514068 (or 514058 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 128512750 is about 11336.3464131968. The cubic root of 128512750 is about 504.6404655884.

The spelling of 128512750 in words is "one hundred twenty-eight million, five hundred twelve thousand, seven hundred fifty".