128809213280 has 48 divisors (see below), whose sum is σ = 331976476944. Its totient is φ = 46839713280.

The previous prime is 128809213279. The next prime is 128809213327. The reversal of 128809213280 is 82312908821.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36591767 + ... + 36595286.

It is an arithmetic number, because the mean of its divisors is an integer number (6916176603).

Almost surely, 2^128809213280 is an apocalyptic number.

128809213280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128809213280 is an abundant number, since it is smaller than the sum of its proper divisors (203167263664).

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

128809213280 is a wasteful number, since it uses less digits than its factorization.

128809213280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73187079 (or 73187071 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 128809213280 in words is "one hundred twenty-eight billion, eight hundred nine million, two hundred thirteen thousand, two hundred eighty".