128413817 has 4 divisors (see below), whose sum is σ = 146758656. Its totient is φ = 110068980.

The previous prime is 128413787. The next prime is 128413819. The reversal of 128413817 is 718314821.

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 a de Polignac number, because none of the positive numbers 2^k-128413817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128413819) 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, 9172409 + ... + 9172422.

It is an arithmetic number, because the mean of its divisors is an integer number (36689664).

Almost surely, 2^128413817 is an apocalyptic number.

It is an amenable number.

128413817 is a deficient number, since it is larger than the sum of its proper divisors (18344839).

128413817 is an equidigital number, since it uses as much as digits as its factorization.

128413817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18344838.

The product of its digits is 10752, while the sum is 35.

The square root of 128413817 is about 11331.9820419907. The cubic root of 128413817 is about 504.5109365155.

The spelling of 128413817 in words is "one hundred twenty-eight million, four hundred thirteen thousand, eight hundred seventeen".