128817934 has 8 divisors (see below), whose sum is σ = 220830768. Its totient is φ = 55207680.

The previous prime is 128817919. The next prime is 128817943. The reversal of 128817934 is 439718821.

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

It is a congruent 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, 4600627 + ... + 4600654.

It is an arithmetic number, because the mean of its divisors is an integer number (27603846).

Almost surely, 2^128817934 is an apocalyptic number.

128817934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128817934 is a deficient number, since it is larger than the sum of its proper divisors (92012834).

128817934 is an equidigital number, since it uses as much as digits as its factorization.

128817934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201290.

The product of its digits is 96768, while the sum is 43.

The square root of 128817934 is about 11349.7988528432. The cubic root of 128817934 is about 505.0396126166.

The spelling of 128817934 in words is "one hundred twenty-eight million, eight hundred seventeen thousand, nine hundred thirty-four".