128867009040 has 720 divisors, whose sum is σ = 578141478720. Its totient is φ = 25366763520.

The previous prime is 128867009039. The next prime is 128867009071. The reversal of 128867009040 is 40900768821.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 7364782 + ... + 7382258.

It is an arithmetic number, because the mean of its divisors is an integer number (802974276).

Almost surely, 2^128867009040 is an apocalyptic number.

128867009040 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 128867009040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289070739360).

128867009040 is an abundant number, since it is smaller than the sum of its proper divisors (449274469680).

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

128867009040 is a wasteful number, since it uses less digits than its factorization.

128867009040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17540 (or 17524 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 128867009040 in words is "one hundred twenty-eight billion, eight hundred sixty-seven million, nine thousand, forty".