128061720 has 96 divisors (see below), whose sum is σ = 419627520. Its totient is φ = 33868800.

The previous prime is 128061719. The next prime is 128061749. The reversal of 128061720 is 27160821.

128061720 is a `hidden beast` number, since 1 + 28 + 0 + 617 + 20 = 666.

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, 44320 + ... + 47120.

It is an arithmetic number, because the mean of its divisors is an integer number (4371120).

Almost surely, 2^128061720 is an apocalyptic number.

128061720 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 128061720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209813760).

128061720 is an abundant number, since it is smaller than the sum of its proper divisors (291565800).

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

128061720 is a wasteful number, since it uses less digits than its factorization.

128061720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945 (or 2938 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 128061720 is about 11316.4358346610. The cubic root of 128061720 is about 504.0494093661.

The spelling of 128061720 in words is "one hundred twenty-eight million, sixty-one thousand, seven hundred twenty".