128779308000 has 864 divisors, whose sum is σ = 543164626368. Its totient is φ = 29393280000.

The previous prime is 128779307989. The next prime is 128779308079. The reversal of 128779308000 is 803977821.

It is a tau number, because it is divible by the number of its divisors (864).

It is a super-2 number, since 2×128779308000² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 183707650 + ... + 183708350.

It is an arithmetic number, because the mean of its divisors is an integer number (628662762).

Almost surely, 2^128779308000 is an apocalyptic number.

128779308000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128779308000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271582313184).

128779308000 is an abundant number, since it is smaller than the sum of its proper divisors (414385318368).

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

128779308000 is an frugal number, since it uses more digits than its factorization.

128779308000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 128779308000 in words is "one hundred twenty-eight billion, seven hundred seventy-nine million, three hundred eight thousand".