128706732 has 270 divisors, whose sum is σ = 436635276. Its totient is φ = 32931360.

The previous prime is 128706719. The next prime is 128706751. The reversal of 128706732 is 237607821.

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

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 1920963 + ... + 1921029.

Almost surely, 2^128706732 is an apocalyptic number.

128706732 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 128706732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218317638).

128706732 is an abundant number, since it is smaller than the sum of its proper divisors (307928544).

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

128706732 is a wasteful number, since it uses less digits than its factorization.

128706732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 128706732 is about 11344.8989418152. The cubic root of 128706732 is about 504.8942457373.

The spelling of 128706732 in words is "one hundred twenty-eight million, seven hundred six thousand, seven hundred thirty-two".