128696220 has 72 divisors (see below), whose sum is σ = 394299360. Its totient is φ = 33974400.

The previous prime is 128696207. The next prime is 128696251. The reversal of 128696220 is 22696821.

It is a happy number.

128696220 is a `hidden beast` number, since 1 + 28 + 6 + 9 + 622 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14641 + ... + 21719.

It is an arithmetic number, because the mean of its divisors is an integer number (5476380).

Almost surely, 2^128696220 is an apocalyptic number.

128696220 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 128696220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197149680).

128696220 is an abundant number, since it is smaller than the sum of its proper divisors (265603140).

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

128696220 is a wasteful number, since it uses less digits than its factorization.

128696220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7195 (or 7190 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 128696220 is about 11344.4356404362. The cubic root of 128696220 is about 504.8804997772.

The spelling of 128696220 in words is "one hundred twenty-eight million, six hundred ninety-six thousand, two hundred twenty".