128450569 has 8 divisors (see below), whose sum is σ = 142070600. Its totient is φ = 115364736.

The previous prime is 128450563. The next prime is 128450617. The reversal of 128450569 is 965054821.

It can be written as a sum of positive squares in 4 ways, for example, as 43718544 + 84732025 = 6612^2 + 9205^2 .

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 128450569 - 2⁹ = 128450057 is a prime.

It is a super-2 number, since 2×128450569² = 32999097352847522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128450563) 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, 133044 + ... + 134005.

It is an arithmetic number, because the mean of its divisors is an integer number (17758825).

Almost surely, 2^128450569 is an apocalyptic number.

It is an amenable number.

128450569 is a deficient number, since it is larger than the sum of its proper divisors (13620031).

128450569 is a wasteful number, since it uses less digits than its factorization.

128450569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267099.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 128450569 is about 11333.6035310928. The cubic root of 128450569 is about 504.5590622229.

It can be divided in two parts, 12845056 and 9, that multiplied together give a square (115605504 = 10752²).

The spelling of 128450569 in words is "one hundred twenty-eight million, four hundred fifty thousand, five hundred sixty-nine".