128309322 has 8 divisors (see below), whose sum is σ = 256618656. Its totient is φ = 42769772.

The previous prime is 128309317. The next prime is 128309323. The reversal of 128309322 is 223903821.

It is a happy number.

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

128309322 is an admirable number.

It is a super-2 number, since 2×128309322² = 32926564224199368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128309322.

It is not an unprimeable number, because it can be changed into a prime (128309323) 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, 10692438 + ... + 10692449.

It is an arithmetic number, because the mean of its divisors is an integer number (32077332).

Almost surely, 2^128309322 is an apocalyptic number.

128309322 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128309322 is a wasteful number, since it uses less digits than its factorization.

128309322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21384892.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 128309322 is about 11327.3704803895. The cubic root of 128309322 is about 504.3740530716.

The spelling of 128309322 in words is "one hundred twenty-eight million, three hundred nine thousand, three hundred twenty-two".