128605750 has 64 divisors (see below), whose sum is σ = 296360064. Its totient is φ = 40694400.

The previous prime is 128605739. The next prime is 128605777. The reversal of 128605750 is 57506821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19924 + ... + 25576.

It is an arithmetic number, because the mean of its divisors is an integer number (4630626).

Almost surely, 2^128605750 is an apocalyptic number.

128605750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128605750 is an abundant number, since it is smaller than the sum of its proper divisors (167754314).

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

128605750 is a wasteful number, since it uses less digits than its factorization.

128605750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5690 (or 5680 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 128605750 is about 11340.4475220337. The cubic root of 128605750 is about 504.7621662159.

The spelling of 128605750 in words is "one hundred twenty-eight million, six hundred five thousand, seven hundred fifty".