128128750 has 20 divisors (see below), whose sum is σ = 240166872. Its totient is φ = 51251000.

The previous prime is 128128739. The next prime is 128128769. The reversal of 128128750 is 57821821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50002 + ... + 52501.

Almost surely, 2^128128750 is an apocalyptic number.

128128750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128128750 is a deficient number, since it is larger than the sum of its proper divisors (112038122).

128128750 is an equidigital number, since it uses as much as digits as its factorization.

128128750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102525 (or 102510 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 128128750 is about 11319.3970687488. The cubic root of 128128750 is about 504.1373371216.

The spelling of 128128750 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, seven hundred fifty".