128894433 has 8 divisors (see below), whose sum is σ = 171921888. Its totient is φ = 85898304.

The previous prime is 128894431. The next prime is 128894443. The reversal of 128894433 is 334498821.

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

It is not a de Polignac number, because 128894433 - 2¹ = 128894431 is a prime.

It is a super-2 number, since 2×128894433² = 33227549716782978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128894431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4585 + ... + 16697.

It is an arithmetic number, because the mean of its divisors is an integer number (21490236).

Almost surely, 2^128894433 is an apocalyptic number.

It is an amenable number.

128894433 is a deficient number, since it is larger than the sum of its proper divisors (43027455).

128894433 is a wasteful number, since it uses less digits than its factorization.

128894433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15663.

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

The square root of 128894433 is about 11353.1684123860. The cubic root of 128894433 is about 505.1395660387.

The spelling of 128894433 in words is "one hundred twenty-eight million, eight hundred ninety-four thousand, four hundred thirty-three".