128022005 has 8 divisors (see below), whose sum is σ = 153962424. Its totient is φ = 102193600.

The previous prime is 128021989. The next prime is 128022007. The reversal of 128022005 is 500220821.

It can be written as a sum of positive squares in 4 ways, for example, as 264196 + 127757809 = 514^2 + 11303^2 .

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

It is not a de Polignac number, because 128022005 - 2⁴ = 128021989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128022007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25466 + ... + 30075.

It is an arithmetic number, because the mean of its divisors is an integer number (19245303).

Almost surely, 2^128022005 is an apocalyptic number.

It is an amenable number.

128022005 is a deficient number, since it is larger than the sum of its proper divisors (25940419).

128022005 is an equidigital number, since it uses as much as digits as its factorization.

128022005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56007.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 128022005 is about 11314.6809499871. The cubic root of 128022005 is about 503.9972980560.

Adding to 128022005 its reverse (500220821), we get a palindrome (628242826).

The spelling of 128022005 in words is "one hundred twenty-eight million, twenty-two thousand, five".