128284705 has 8 divisors (see below), whose sum is σ = 154082304. Its totient is φ = 102534000.

The previous prime is 128284697. The next prime is 128284721. The reversal of 128284705 is 507482821.

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

It is not a de Polignac number, because 128284705 - 2³ = 128284697 is a prime.

It is a super-3 number, since 3×128284705³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5391 + ... + 16900.

It is an arithmetic number, because the mean of its divisors is an integer number (19260288).

Almost surely, 2^128284705 is an apocalyptic number.

It is an amenable number.

128284705 is a deficient number, since it is larger than the sum of its proper divisors (25797599).

128284705 is a wasteful number, since it uses less digits than its factorization.

128284705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23447.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 128284705 is about 11326.2838124426. The cubic root of 128284705 is about 504.3417951655.

The spelling of 128284705 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, seven hundred five".