128009783427 has 16 divisors (see below), whose sum is σ = 176835687840. Its totient is φ = 82270883072.

The previous prime is 128009783417. The next prime is 128009783453. The reversal of 128009783427 is 724387900821.

It is a cyclic number.

It is not a de Polignac number, because 128009783427 - 2¹⁹ = 128009259139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128009783427.

It is not an unprimeable number, because it can be changed into a prime (128009783417) 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, 1069818 + ... + 1183439.

It is an arithmetic number, because the mean of its divisors is an integer number (11052230490).

Almost surely, 2^128009783427 is an apocalyptic number.

128009783427 is a deficient number, since it is larger than the sum of its proper divisors (48825904413).

128009783427 is a wasteful number, since it uses less digits than its factorization.

128009783427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253942.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 128009783427 in words is "one hundred twenty-eight billion, nine million, seven hundred eighty-three thousand, four hundred twenty-seven".