128005556307 has 8 divisors (see below), whose sum is σ = 170695118784. Its totient is φ = 85326515688.

The previous prime is 128005556293. The next prime is 128005556311. The reversal of 128005556307 is 703655500821.

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

It is not a de Polignac number, because 128005556307 - 2¹⁰ = 128005555283 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128005556807) 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, 2602033 + ... + 2650770.

It is an arithmetic number, because the mean of its divisors is an integer number (21336889848).

Almost surely, 2^128005556307 is an apocalyptic number.

128005556307 is a deficient number, since it is larger than the sum of its proper divisors (42689562477).

128005556307 is an equidigital number, since it uses as much as digits as its factorization.

128005556307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260929.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 128005556307 in words is "one hundred twenty-eight billion, five million, five hundred fifty-six thousand, three hundred seven".