128644600 has 72 divisors (see below), whose sum is σ = 347957640. Its totient is φ = 44103360.

The previous prime is 128644591. The next prime is 128644619. The reversal of 128644600 is 6446821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3237 + ... + 16363.

It is an arithmetic number, because the mean of its divisors is an integer number (4832745).

Almost surely, 2^128644600 is an apocalyptic number.

128644600 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 128644600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173978820).

128644600 is an abundant number, since it is smaller than the sum of its proper divisors (219313040).

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

128644600 is a wasteful number, since it uses less digits than its factorization.

128644600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13157 (or 13141 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 128644600 is about 11342.1602880580. The cubic root of 128644600 is about 504.8129882977.

The spelling of 128644600 in words is "one hundred twenty-eight million, six hundred forty-four thousand, six hundred".