128642313 has 4 divisors (see below), whose sum is σ = 171523088. Its totient is φ = 85761540.

The previous prime is 128642287. The next prime is 128642317. The reversal of 128642313 is 313246821.

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.

It is not a de Polignac number, because 128642313 - 2⁶ = 128642249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128642317) 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, 21440383 + ... + 21440388.

It is an arithmetic number, because the mean of its divisors is an integer number (42880772).

Almost surely, 2^128642313 is an apocalyptic number.

It is an amenable number.

128642313 is a deficient number, since it is larger than the sum of its proper divisors (42880775).

128642313 is an equidigital number, since it uses as much as digits as its factorization.

128642313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42880774.

The product of its digits is 6912, while the sum is 30.

The square root of 128642313 is about 11342.0594690735. The cubic root of 128642313 is about 504.8099968154.

The spelling of 128642313 in words is "one hundred twenty-eight million, six hundred forty-two thousand, three hundred thirteen".