128698 has 8 divisors (see below), whose sum is σ = 194580. Its totient is φ = 63840.

The previous prime is 128693. The next prime is 128717. The reversal of 128698 is 896821.

It can be written as a sum of positive squares in 2 ways, for example, as 113569 + 15129 = 337^2 + 123^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318 + ... + 598.

2¹²⁸⁶⁹⁸ is an apocalyptic number.

128698 is a deficient number, since it is larger than the sum of its proper divisors (65882).

128698 is a wasteful number, since it uses less digits than its factorization.

128698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 6912, while the sum is 34.

The square root of 128698 is about 358.7450348088. The cubic root of 128698 is about 50.4882827437.

The spelling of 128698 in words is "one hundred twenty-eight thousand, six hundred ninety-eight".