128944657258 has 8 divisors (see below), whose sum is σ = 201826420128. Its totient is φ = 61669183884.

The previous prime is 128944657253. The next prime is 128944657273. The reversal of 128944657258 is 852756449821.

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

It is a junction number, because it is equal to n+sod(n) for n = 128944657196 and 128944657205.

It is not an unprimeable number, because it can be changed into a prime (128944657253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401572316 + ... + 1401572407.

It is an arithmetic number, because the mean of its divisors is an integer number (25228302516).

Almost surely, 2^128944657258 is an apocalyptic number.

128944657258 is a deficient number, since it is larger than the sum of its proper divisors (72881762870).

128944657258 is a wasteful number, since it uses less digits than its factorization.

128944657258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803144748.

The product of its digits is 38707200, while the sum is 61.

The spelling of 128944657258 in words is "one hundred twenty-eight billion, nine hundred forty-four million, six hundred fifty-seven thousand, two hundred fifty-eight".