128849520789 has 12 divisors (see below), whose sum is σ = 203035608672. Its totient is φ = 78090618600.

The previous prime is 128849520731. The next prime is 128849520791. The reversal of 128849520789 is 987025948821.

128849520789 is a `hidden beast` number, since 1 + 28 + 8 + 4 + 9 + 520 + 7 + 89 = 666.

It is not a de Polignac number, because 128849520789 - 2⁹ = 128849520277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128849525789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 650755057 + ... + 650755254.

It is an arithmetic number, because the mean of its divisors is an integer number (16919634056).

Almost surely, 2^128849520789 is an apocalyptic number.

It is an amenable number.

128849520789 is a deficient number, since it is larger than the sum of its proper divisors (74186087883).

128849520789 is a wasteful number, since it uses less digits than its factorization.

128849520789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301510328 (or 1301510325 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 63.

The spelling of 128849520789 in words is "one hundred twenty-eight billion, eight hundred forty-nine million, five hundred twenty thousand, seven hundred eighty-nine".