128432894 has 32 divisors (see below), whose sum is σ = 207567360. Its totient is φ = 59421600.

The previous prime is 128432893. The next prime is 128432917. The reversal of 128432894 is 498234821.

It is a super-2 number, since 2×128432894² = 32990016522430472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128432893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488207 + ... + 488469.

It is an arithmetic number, because the mean of its divisors is an integer number (6486480).

Almost surely, 2^128432894 is an apocalyptic number.

128432894 is a deficient number, since it is larger than the sum of its proper divisors (79134466).

128432894 is a wasteful number, since it uses less digits than its factorization.

128432894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its digits is 110592, while the sum is 41.

The square root of 128432894 is about 11332.8237434454. The cubic root of 128432894 is about 504.5359184549.

The spelling of 128432894 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, eight hundred ninety-four".