128028417634385 has 4 divisors (see below), whose sum is σ = 153634101161268. Its totient is φ = 102422734107504.

The previous prime is 128028417634379. The next prime is 128028417634391. The reversal of 128028417634385 is 583436714820821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128028417634379) and next prime (128028417634391).

It can be written as a sum of positive squares in 2 ways, for example, as 54494499797521 + 73533917836864 = 7382039^2 + 8575192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128028417634385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12802841763434 + ... + 12802841763443.

It is an arithmetic number, because the mean of its divisors is an integer number (38408525290317).

Almost surely, 2^{128028417634385} is an apocalyptic number.

It is an amenable number.

128028417634385 is a deficient number, since it is larger than the sum of its proper divisors (25605683526883).

128028417634385 is an equidigital number, since it uses as much as digits as its factorization.

128028417634385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605683526882.

The product of its (nonzero) digits is 61931520, while the sum is 62.

The spelling of 128028417634385 in words is "one hundred twenty-eight trillion, twenty-eight billion, four hundred seventeen million, six hundred thirty-four thousand, three hundred eighty-five".