206628081 has 32 divisors (see below), whose sum is σ = 319334400. Its totient is φ = 117454080.

The previous prime is 206628077. The next prime is 206628119. The reversal of 206628081 is 180826602.

It is not a de Polignac number, because 206628081 - 2² = 206628077 is a prime.

It is a super-2 number, since 2×206628081² = 85390327715485122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206628001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245860 + ... + 246698.

It is an arithmetic number, because the mean of its divisors is an integer number (9979200).

Almost surely, 2^206628081 is an apocalyptic number.

It is an amenable number.

206628081 is a deficient number, since it is larger than the sum of its proper divisors (112706319).

206628081 is a wasteful number, since it uses less digits than its factorization.

206628081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 206628081 is about 14374.5636803348. The cubic root of 206628081 is about 591.1936773790.

The spelling of 206628081 in words is "two hundred six million, six hundred twenty-eight thousand, eighty-one".