128281432 has 16 divisors (see below), whose sum is σ = 242260200. Its totient is φ = 63678720.

The previous prime is 128281429. The next prime is 128281463. The reversal of 128281432 is 234182821.

It is a happy number.

It is a super-3 number, since 3×128281432³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 128281394 and 128281403.

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, 56569 + ... + 58792.

Almost surely, 2^128281432 is an apocalyptic number.

It is an amenable number.

128281432 is a deficient number, since it is larger than the sum of its proper divisors (113978768).

128281432 is a wasteful number, since it uses less digits than its factorization.

128281432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115506 (or 115502 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 128281432 is about 11326.1393245889. The cubic root of 128281432 is about 504.3375059435.

The spelling of 128281432 in words is "one hundred twenty-eight million, two hundred eighty-one thousand, four hundred thirty-two".