206647728 has 80 divisors (see below), whose sum is σ = 614294016. Its totient is φ = 58636800.

The previous prime is 206647657. The next prime is 206647729. The reversal of 206647728 is 827746602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 206647728.

It is not an unprimeable number, because it can be changed into a prime (206647729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48700 + ... + 52772.

Almost surely, 2^206647728 is an apocalyptic number.

206647728 is a gapful number since it is divisible by the number (28) 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 206647728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307147008).

206647728 is an abundant number, since it is smaller than the sum of its proper divisors (407646288).

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

206647728 is a wasteful number, since it uses less digits than its factorization.

206647728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242 (or 4236 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 206647728 is about 14375.2470587465. The cubic root of 206647728 is about 591.2124144484.

It can be divided in two parts, 2066 and 47728, that added together give a palindrome (49794).

The spelling of 206647728 in words is "two hundred six million, six hundred forty-seven thousand, seven hundred twenty-eight".