128034817 has 4 divisors (see below), whose sum is σ = 128057776. Its totient is φ = 128011860.

The previous prime is 128034799. The next prime is 128034821. The reversal of 128034817 is 718430821.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 128034817 - 2¹¹ = 128032769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128034017) 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, 2842 + ... + 16252.

It is an arithmetic number, because the mean of its divisors is an integer number (32014444).

Almost surely, 2^128034817 is an apocalyptic number.

It is an amenable number.

128034817 is a deficient number, since it is larger than the sum of its proper divisors (22959).

128034817 is an equidigital number, since it uses as much as digits as its factorization.

128034817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22958.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 128034817 is about 11315.2471029138. The cubic root of 128034817 is about 504.0141102647.

The spelling of 128034817 in words is "one hundred twenty-eight million, thirty-four thousand, eight hundred seventeen".