128008671749 has 8 divisors (see below), whose sum is σ = 146306475840. Its totient is φ = 109713580416.

The previous prime is 128008671737. The next prime is 128008671809. The reversal of 128008671749 is 947176800821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128008671749 - 2⁸ = 128008671493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128008671749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128008671149) 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 7 ways as a sum of consecutive naturals, for example, 576044 + ... + 766709.

It is an arithmetic number, because the mean of its divisors is an integer number (18288309480).

Almost surely, 2^128008671749 is an apocalyptic number.

It is an amenable number.

128008671749 is a deficient number, since it is larger than the sum of its proper divisors (18297804091).

128008671749 is a wasteful number, since it uses less digits than its factorization.

128008671749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356379.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 128008671749 in words is "one hundred twenty-eight billion, eight million, six hundred seventy-one thousand, seven hundred forty-nine".