128730 has 32 divisors (see below), whose sum is σ = 353664. Its totient is φ = 29376.

The previous prime is 128717. The next prime is 128747. The reversal of 128730 is 37821.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 128697 and 128706.

It is an unprimeable number.

128730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97 + ... + 516.

It is an arithmetic number, because the mean of its divisors is an integer number (11052).

2¹²⁸⁷³⁰ is an apocalyptic number.

128730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128730 is an abundant number, since it is smaller than the sum of its proper divisors (224934).

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

128730 is a wasteful number, since it uses less digits than its factorization.

128730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 128730 is about 358.7896319572. The cubic root of 128730 is about 50.4924669350.

Subtracting from 128730 its reverse (37821), we obtain a palindrome (90909).

It can be divided in two parts, 128 and 730, that added together give a palindrome (858).

The spelling of 128730 in words is "one hundred twenty-eight thousand, seven hundred thirty".