128530500 has 96 divisors (see below), whose sum is σ = 427784448. Its totient is φ = 29376000.

The previous prime is 128530499. The next prime is 128530513. The reversal of 128530500 is 5035821.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4380 + ... + 16620.

It is an arithmetic number, because the mean of its divisors is an integer number (4456088).

Almost surely, 2^128530500 is an apocalyptic number.

128530500 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 128530500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213892224).

128530500 is an abundant number, since it is smaller than the sum of its proper divisors (299253948).

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

128530500 is a wasteful number, since it uses less digits than its factorization.

128530500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12270 (or 12258 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 128530500 is about 11337.1292662649. The cubic root of 128530500 is about 504.6636979289.

The spelling of 128530500 in words is "one hundred twenty-eight million, five hundred thirty thousand, five hundred".