128447441280 has 640 divisors, whose sum is σ = 506888902080. Its totient is φ = 30831280128.

The previous prime is 128447441267. The next prime is 128447441321. The reversal of 128447441280 is 82144744821.

128447441280 is a `hidden beast` number, since 12 + 84 + 4 + 74 + 412 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

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 79 ways as a sum of consecutive naturals, for example, 20266272 + ... + 20272608.

Almost surely, 2^128447441280 is an apocalyptic number.

128447441280 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 128447441280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253444451040).

128447441280 is an abundant number, since it is smaller than the sum of its proper divisors (378441460800).

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

128447441280 is a wasteful number, since it uses less digits than its factorization.

128447441280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6408 (or 6387 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 45.

The spelling of 128447441280 in words is "one hundred twenty-eight billion, four hundred forty-seven million, four hundred forty-one thousand, two hundred eighty".