128893434 has 8 divisors (see below), whose sum is σ = 257786880. Its totient is φ = 42964476.

The previous prime is 128893423. The next prime is 128893441. The reversal of 128893434 is 434398821.

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

128893434 is an admirable number.

It is a super-2 number, since 2×128893434² = 33227034656624712, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10741114 + ... + 10741125.

It is an arithmetic number, because the mean of its divisors is an integer number (32223360).

Almost surely, 2^128893434 is an apocalyptic number.

128893434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128893434 is a wasteful number, since it uses less digits than its factorization.

128893434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482244.

The product of its digits is 165888, while the sum is 42.

The square root of 128893434 is about 11353.1244157721. The cubic root of 128893434 is about 505.1382610025.

The spelling of 128893434 in words is "one hundred twenty-eight million, eight hundred ninety-three thousand, four hundred thirty-four".