128698369 has 4 divisors (see below), whose sum is σ = 128750596. Its totient is φ = 128646144.

The previous prime is 128698351. The next prime is 128698399. The reversal of 128698369 is 963896821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53217025 + 75481344 = 7295^2 + 8688^2 .

It is a cyclic number.

It is not a de Polignac number, because 128698369 - 2⁵ = 128698337 is a prime.

It is a super-2 number, since 2×128698369² = 33126540366520322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128698309) 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, 22224 + ... + 27409.

It is an arithmetic number, because the mean of its divisors is an integer number (32187649).

Almost surely, 2^128698369 is an apocalyptic number.

It is an amenable number.

128698369 is a deficient number, since it is larger than the sum of its proper divisors (52227).

128698369 is an equidigital number, since it uses as much as digits as its factorization.

128698369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52226.

The product of its digits is 1119744, while the sum is 52.

The square root of 128698369 is about 11344.5303560791. The cubic root of 128698369 is about 504.8833099663.

The spelling of 128698369 in words is "one hundred twenty-eight million, six hundred ninety-eight thousand, three hundred sixty-nine".