128581300 has 18 divisors (see below), whose sum is σ = 279021638. Its totient is φ = 51432480.

The previous prime is 128581291. The next prime is 128581307. The reversal of 128581300 is 3185821.

It can be written as a sum of positive squares in 3 ways, for example, as 1838736 + 126742564 = 1356^2 + 11258^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128581307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642807 + ... + 643006.

Almost surely, 2^128581300 is an apocalyptic number.

128581300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128581300 is an abundant number, since it is smaller than the sum of its proper divisors (150440338).

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

128581300 is a wasteful number, since it uses less digits than its factorization.

128581300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285827 (or 1285820 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 128581300 is about 11339.3694710068. The cubic root of 128581300 is about 504.7301764146.

It can be divided in two parts, 128581 and 300, that added together give a square (128881 = 359²).

The spelling of 128581300 in words is "one hundred twenty-eight million, five hundred eighty-one thousand, three hundred".