128765921592 has 256 divisors, whose sum is σ = 447325286400. Its totient is φ = 29821409280.

The previous prime is 128765921587. The next prime is 128765921621. The reversal of 128765921592 is 295129567821.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 489043 + ... + 704765.

It is an arithmetic number, because the mean of its divisors is an integer number (1747364400).

Almost surely, 2^128765921592 is an apocalyptic number.

128765921592 is a gapful number since it is divisible by the number (12) 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 128765921592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223662643200).

128765921592 is an abundant number, since it is smaller than the sum of its proper divisors (318559364808).

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

128765921592 is a wasteful number, since it uses less digits than its factorization.

128765921592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215786 (or 215782 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 57.

The spelling of 128765921592 in words is "one hundred twenty-eight billion, seven hundred sixty-five million, nine hundred twenty-one thousand, five hundred ninety-two".