128733660 has 144 divisors (see below), whose sum is σ = 431907840. Its totient is φ = 30775680.

The previous prime is 128733659. The next prime is 128733713. The reversal of 128733660 is 66337821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156009 + ... + 156831.

It is an arithmetic number, because the mean of its divisors is an integer number (2999360).

Almost surely, 2^128733660 is an apocalyptic number.

128733660 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 128733660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215953920).

128733660 is an abundant number, since it is smaller than the sum of its proper divisors (303174180).

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

128733660 is a wasteful number, since it uses less digits than its factorization.

128733660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 128733660 is about 11346.0856686348. The cubic root of 128733660 is about 504.9294545773.

The spelling of 128733660 in words is "one hundred twenty-eight million, seven hundred thirty-three thousand, six hundred sixty".