128704669 has 4 divisors (see below), whose sum is σ = 128727360. Its totient is φ = 128681980.

The previous prime is 128704663. The next prime is 128704691. The reversal of 128704669 is 966407821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 128704669 - 2¹¹ = 128702621 is a prime.

It is a super-2 number, since 2×128704669² = 33129783644799122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128704663) 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, 5574 + ... + 16984.

It is an arithmetic number, because the mean of its divisors is an integer number (32181840).

Almost surely, 2^128704669 is an apocalyptic number.

It is an amenable number.

128704669 is a deficient number, since it is larger than the sum of its proper divisors (22691).

128704669 is a wasteful number, since it uses less digits than its factorization.

128704669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22690.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 128704669 is about 11344.8080195303. The cubic root of 128704669 is about 504.8915481255.

The spelling of 128704669 in words is "one hundred twenty-eight million, seven hundred four thousand, six hundred sixty-nine".