128221783600 has 30 divisors (see below), whose sum is σ = 308052836060. Its totient is φ = 51288713280.

The previous prime is 128221783553. The next prime is 128221783643. The reversal of 128221783600 is 6387122821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160276830 + ... + 160277629.

Almost surely, 2^128221783600 is an apocalyptic number.

128221783600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128221783600 is an abundant number, since it is smaller than the sum of its proper divisors (179831052460).

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

128221783600 is a wasteful number, since it uses less digits than its factorization.

128221783600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320554477 (or 320554466 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 128221783600 in words is "one hundred twenty-eight billion, two hundred twenty-one million, seven hundred eighty-three thousand, six hundred".