206660128 has 48 divisors (see below), whose sum is σ = 417795840. Its totient is φ = 100578816.

The previous prime is 206660101. The next prime is 206660137. The reversal of 206660128 is 821066602.

It is a self number, because there is not a number n which added to its sum of digits gives 206660128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470533 + ... + 470971.

It is an arithmetic number, because the mean of its divisors is an integer number (8704080).

Almost surely, 2^206660128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206660128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208897920).

206660128 is an abundant number, since it is smaller than the sum of its proper divisors (211135712).

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

206660128 is a wasteful number, since it uses less digits than its factorization.

206660128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 206660128 is about 14375.6783492119. The cubic root of 206660128 is about 591.2242395438.

The spelling of 206660128 in words is "two hundred six million, six hundred sixty thousand, one hundred twenty-eight".