128705901 has 8 divisors (see below), whose sum is σ = 171665664. Its totient is φ = 85775040.

The previous prime is 128705891. The next prime is 128705903. The reversal of 128705901 is 109507821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128705901 - 2⁹ = 128705389 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128705903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7396 + ... + 17666.

It is an arithmetic number, because the mean of its divisors is an integer number (21458208).

Almost surely, 2^128705901 is an apocalyptic number.

It is an amenable number.

128705901 is a deficient number, since it is larger than the sum of its proper divisors (42959763).

128705901 is a wasteful number, since it uses less digits than its factorization.

128705901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14451.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 128705901 is about 11344.8623173664. The cubic root of 128705901 is about 504.8931591119.

The spelling of 128705901 in words is "one hundred twenty-eight million, seven hundred five thousand, nine hundred one".