128405450 has 24 divisors (see below), whose sum is σ = 239181120. Its totient is φ = 51287600.

The previous prime is 128405443. The next prime is 128405489. The reversal of 128405450 is 54504821.

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 11 ways as a sum of consecutive naturals, for example, 44141 + ... + 46959.

It is an arithmetic number, because the mean of its divisors is an integer number (9965880).

Almost surely, 2^128405450 is an apocalyptic number.

128405450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128405450 is a deficient number, since it is larger than the sum of its proper divisors (110775670).

128405450 is a wasteful number, since it uses less digits than its factorization.

128405450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3737 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 128405450 is about 11331.6128596065. The cubic root of 128405450 is about 504.4999788818.

The spelling of 128405450 in words is "one hundred twenty-eight million, four hundred five thousand, four hundred fifty".