128722360640 has 168 divisors, whose sum is σ = 317574667872. Its totient is φ = 49692764160.

The previous prime is 128722360633. The next prime is 128722360649. The reversal of 128722360640 is 46063227821.

It is a super-2 number, since 2×128722360640² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128722360649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57387359 + ... + 57389601.

It is an arithmetic number, because the mean of its divisors is an integer number (1890325404).

Almost surely, 2^128722360640 is an apocalyptic number.

128722360640 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 128722360640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158787333936).

128722360640 is an abundant number, since it is smaller than the sum of its proper divisors (188852307232).

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

128722360640 is a wasteful number, since it uses less digits than its factorization.

128722360640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 128722360640 in words is "one hundred twenty-eight billion, seven hundred twenty-two million, three hundred sixty thousand, six hundred forty".