128385317440 has 112 divisors (see below), whose sum is σ = 311813618688. Its totient is φ = 50332166144.

The previous prime is 128385317407. The next prime is 128385317471. The reversal of 128385317440 is 44713583821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18703449 + ... + 18710311.

Almost surely, 2^128385317440 is an apocalyptic number.

128385317440 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 128385317440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155906809344).

128385317440 is an abundant number, since it is smaller than the sum of its proper divisors (183428301248).

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

128385317440 is a wasteful number, since it uses less digits than its factorization.

128385317440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8036 (or 8026 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 128385317440 in words is "one hundred twenty-eight billion, three hundred eighty-five million, three hundred seventeen thousand, four hundred forty".