128266020 has 144 divisors (see below), whose sum is σ = 416078208. Its totient is φ = 31872000.

The previous prime is 128266001. The next prime is 128266027. The reversal of 128266020 is 20662821.

It is not an unprimeable number, because it can be changed into a prime (128266027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 510895 + ... + 511145.

It is an arithmetic number, because the mean of its divisors is an integer number (2889432).

Almost surely, 2^128266020 is an apocalyptic number.

128266020 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 128266020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208039104).

128266020 is an abundant number, since it is smaller than the sum of its proper divisors (287812188).

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

128266020 is a wasteful number, since it uses less digits than its factorization.

128266020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 128266020 is about 11325.4589310986. The cubic root of 128266020 is about 504.3173077464.

The spelling of 128266020 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, twenty".