128601709 has 8 divisors (see below), whose sum is σ = 135854240. Its totient is φ = 121397616.

The previous prime is 128601703. The next prime is 128601731. The reversal of 128601709 is 907106821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128601709 - 2⁹ = 128601197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128601703) 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, 6582 + ... + 17335.

It is an arithmetic number, because the mean of its divisors is an integer number (16981780).

Almost surely, 2^128601709 is an apocalyptic number.

128601709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

128601709 is a deficient number, since it is larger than the sum of its proper divisors (7252531).

128601709 is a wasteful number, since it uses less digits than its factorization.

128601709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24219.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 128601709 is about 11340.2693530621. The cubic root of 128601709 is about 504.7568793468.

The spelling of 128601709 in words is "one hundred twenty-eight million, six hundred one thousand, seven hundred nine".