128670711849 has 9 divisors (see below), whose sum is σ = 185859249303. Its totient is φ = 85779757152.

The previous prime is 128670711847. The next prime is 128670711853. The reversal of 128670711849 is 948117076821.

The square root of 128670711849 is 358707.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 112153321449 + 16517390400 = 334893^2 + 128520^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 128670711849 - 2¹ = 128670711847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128670711795 and 128670711804.

It is not an unprimeable number, because it can be changed into a prime (128670711847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1016337 + ... + 1135905.

Almost surely, 2^128670711849 is an apocalyptic number.

128670711849 is the 358707-th square number.

128670711849 is the 179354-th centered octagonal number.

It is an amenable number.

128670711849 is a deficient number, since it is larger than the sum of its proper divisors (57188537454).

128670711849 is an frugal number, since it uses more digits than its factorization.

128670711849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239144 (or 119572 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 128670711849 in words is "one hundred twenty-eight billion, six hundred seventy million, seven hundred eleven thousand, eight hundred forty-nine".