128312319 has 16 divisors (see below), whose sum is σ = 175173984. Its totient is φ = 83520000.

The previous prime is 128312287. The next prime is 128312321. The reversal of 128312319 is 913213821.

It is not a de Polignac number, because 128312319 - 2⁵ = 128312287 is a prime.

It is a super-2 number, since 2×128312319² = 32928102414315522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128312369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19219 + ... + 25019.

It is an arithmetic number, because the mean of its divisors is an integer number (10948374).

Almost surely, 2^128312319 is an apocalyptic number.

128312319 is a deficient number, since it is larger than the sum of its proper divisors (46861665).

128312319 is a wasteful number, since it uses less digits than its factorization.

128312319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5978.

The product of its digits is 2592, while the sum is 30.

The square root of 128312319 is about 11327.5027698077. The cubic root of 128312319 is about 504.3779800330.

The spelling of 128312319 in words is "one hundred twenty-eight million, three hundred twelve thousand, three hundred nineteen".