128923321792 has 112 divisors (see below), whose sum is σ = 266121123840. Its totient is φ = 61903641600.

The previous prime is 128923321781. The next prime is 128923321799. The reversal of 128923321792 is 297123329821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128923321799) 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, 225784867 + ... + 225785437.

Almost surely, 2^128923321792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128923321792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133060561920).

128923321792 is an abundant number, since it is smaller than the sum of its proper divisors (137197802048).

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

128923321792 is a wasteful number, since it uses less digits than its factorization.

128923321792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290 (or 1280 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

It can be divided in two parts, 1289233 and 21792, that added together give a square (1311025 = 1145²).

The spelling of 128923321792 in words is "one hundred twenty-eight billion, nine hundred twenty-three million, three hundred twenty-one thousand, seven hundred ninety-two".