128705125 has 32 divisors (see below), whose sum is σ = 169827840. Its totient is φ = 97187200.

The previous prime is 128705123. The next prime is 128705131. The reversal of 128705125 is 521507821.

It is not a de Polignac number, because 128705125 - 2¹ = 128705123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128705123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255624 + ... + 256126.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120).

Almost surely, 2^128705125 is an apocalyptic number.

It is an amenable number.

128705125 is a deficient number, since it is larger than the sum of its proper divisors (41122715).

128705125 is an equidigital number, since it uses as much as digits as its factorization.

128705125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 620 counting only the distinct ones).

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

The square root of 128705125 is about 11344.8281168116. The cubic root of 128705125 is about 504.8921444009.

The spelling of 128705125 in words is "one hundred twenty-eight million, seven hundred five thousand, one hundred twenty-five".