128801660 has 72 divisors (see below), whose sum is σ = 298831680. Its totient is φ = 46595328.

The previous prime is 128801657. The next prime is 128801677. The reversal of 128801660 is 66108821.

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, 178781 + ... + 179499.

It is an arithmetic number, because the mean of its divisors is an integer number (4150440).

Almost surely, 2^128801660 is an apocalyptic number.

128801660 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 128801660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149415840).

128801660 is an abundant number, since it is smaller than the sum of its proper divisors (170030020).

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

128801660 is a wasteful number, since it uses less digits than its factorization.

128801660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 128801660 is about 11349.0819011936. The cubic root of 128801660 is about 505.0183439404.

The spelling of 128801660 in words is "one hundred twenty-eight million, eight hundred one thousand, six hundred sixty".