128743992 has 320 divisors, whose sum is σ = 439084800. Its totient is φ = 34836480.

The previous prime is 128743991. The next prime is 128743997. The reversal of 128743992 is 299347821.

128743992 is a `hidden beast` number, since 128 + 7 + 439 + 92 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (217728) is a multiple of the sum of its prime factors (108).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128743991) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4153017 + ... + 4153047.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^128743992 is an apocalyptic number.

128743992 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 128743992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219542400).

128743992 is an abundant number, since it is smaller than the sum of its proper divisors (310340808).

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

128743992 is a wasteful number, since it uses less digits than its factorization.

128743992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 95 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 128743992 is about 11346.5409707100. The cubic root of 128743992 is about 504.9429625481.

The spelling of 128743992 in words is "one hundred twenty-eight million, seven hundred forty-three thousand, nine hundred ninety-two".