128670308820 has 36 divisors (see below), whose sum is σ = 390299937300. Its totient is φ = 34312082304.

The previous prime is 128670308801. The next prime is 128670308821. The reversal of 128670308820 is 28803076821.

It can be written as a sum of positive squares in 2 ways, for example, as 101043879876 + 27626428944 = 317874^2 + 166212^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128670308821) 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, 357417345 + ... + 357417704.

It is an arithmetic number, because the mean of its divisors is an integer number (10841664925).

Almost surely, 2^128670308820 is an apocalyptic number.

128670308820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128670308820 is an abundant number, since it is smaller than the sum of its proper divisors (261629628480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128670308820 is a wasteful number, since it uses less digits than its factorization.

128670308820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714835064 (or 714835059 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 128670308820 in words is "one hundred twenty-eight billion, six hundred seventy million, three hundred eight thousand, eight hundred twenty".