128208752820 has 144 divisors (see below), whose sum is σ = 404004776448. Its totient is φ = 32875165440.

The previous prime is 128208752809. The next prime is 128208752821. The reversal of 128208752820 is 28257802821.

128208752820 is a `hidden beast` number, since 1 + 2 + 8 + 20 + 87 + 528 + 20 = 666.

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 (128208752821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 802887 + ... + 949233.

Almost surely, 2^128208752820 is an apocalyptic number.

128208752820 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 128208752820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202002388224).

128208752820 is an abundant number, since it is smaller than the sum of its proper divisors (275796023628).

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

128208752820 is a wasteful number, since it uses less digits than its factorization.

128208752820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146550 (or 146545 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 128208752820 in words is "one hundred twenty-eight billion, two hundred eight million, seven hundred fifty-two thousand, eight hundred twenty".