123128444320 has 96 divisors (see below), whose sum is σ = 332675755776. Its totient is φ = 42186393600.

The previous prime is 123128444281. The next prime is 123128444323. The reversal of 123128444320 is 23444821321.

It is a super-2 number, since 2×123128444320² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123128444323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621605 + ... + 1695835.

It is an arithmetic number, because the mean of its divisors is an integer number (3465372456).

Almost surely, 2^123128444320 is an apocalyptic number.

123128444320 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 123128444320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166337877888).

123128444320 is an abundant number, since it is smaller than the sum of its proper divisors (209547311456).

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

123128444320 is a wasteful number, since it uses less digits than its factorization.

123128444320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75734 (or 75726 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The spelling of 123128444320 in words is "one hundred twenty-three billion, one hundred twenty-eight million, four hundred forty-four thousand, three hundred twenty".