128487900 has 72 divisors (see below), whose sum is σ = 378819504. Its totient is φ = 33612800.

The previous prime is 128487889. The next prime is 128487923. The reversal of 128487900 is 9784821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11860 + ... + 19940.

It is an arithmetic number, because the mean of its divisors is an integer number (5261382).

Almost surely, 2^128487900 is an apocalyptic number.

128487900 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 128487900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189409752).

128487900 is an abundant number, since it is smaller than the sum of its proper divisors (250331604).

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

128487900 is a wasteful number, since it uses less digits than its factorization.

128487900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8144 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 128487900 is about 11335.2503280695. The cubic root of 128487900 is about 504.6079367175.

The spelling of 128487900 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, nine hundred".