128367768840 has 128 divisors (see below), whose sum is σ = 405698544000. Its totient is φ = 32403621888.

The previous prime is 128367768803. The next prime is 128367768871. The reversal of 128367768840 is 48867763821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2889516 + ... + 2933604.

It is an arithmetic number, because the mean of its divisors is an integer number (3169519875).

Almost surely, 2^128367768840 is an apocalyptic number.

128367768840 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 128367768840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202849272000).

128367768840 is an abundant number, since it is smaller than the sum of its proper divisors (277330775160).

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

128367768840 is a wasteful number, since it uses less digits than its factorization.

128367768840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45399 (or 45395 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 60.

The spelling of 128367768840 in words is "one hundred twenty-eight billion, three hundred sixty-seven million, seven hundred sixty-eight thousand, eight hundred forty".