128929744 has 40 divisors (see below), whose sum is σ = 271450880. Its totient is φ = 59097600.

The previous prime is 128929733. The next prime is 128929747. The reversal of 128929744 is 447929821.

It is a junction number, because it is equal to n+sod(n) for n = 128929694 and 128929703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128929747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2584 + ... + 16264.

It is an arithmetic number, because the mean of its divisors is an integer number (6786272).

Almost surely, 2^128929744 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 128929744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135725440).

128929744 is an abundant number, since it is smaller than the sum of its proper divisors (142521136).

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

128929744 is a wasteful number, since it uses less digits than its factorization.

128929744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13739 (or 13733 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 128929744 is about 11354.7234224353. The cubic root of 128929744 is about 505.1856899719.

The spelling of 128929744 in words is "one hundred twenty-eight million, nine hundred twenty-nine thousand, seven hundred forty-four".