128710691 has 8 divisors (see below), whose sum is σ = 134594304. Its totient is φ = 122851080.

The previous prime is 128710669. The next prime is 128710711. The reversal of 128710691 is 196017821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128710691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128710651) 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, 5456 + ... + 16946.

It is an arithmetic number, because the mean of its divisors is an integer number (16824288).

Almost surely, 2^128710691 is an apocalyptic number.

128710691 is a deficient number, since it is larger than the sum of its proper divisors (5883613).

128710691 is a wasteful number, since it uses less digits than its factorization.

128710691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12001.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 128710691 is about 11345.0734241784. The cubic root of 128710691 is about 504.8994225083.

The spelling of 128710691 in words is "one hundred twenty-eight million, seven hundred ten thousand, six hundred ninety-one".