206628505 has 8 divisors (see below), whose sum is σ = 248032512. Its totient is φ = 165250608.

The previous prime is 206628491. The next prime is 206628511. The reversal of 206628505 is 505826602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206628505 - 2⁵ = 206628473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23214 + ... + 30856.

It is an arithmetic number, because the mean of its divisors is an integer number (31004064).

Almost surely, 2^206628505 is an apocalyptic number.

It is an amenable number.

206628505 is a deficient number, since it is larger than the sum of its proper divisors (41404007).

206628505 is an equidigital number, since it uses as much as digits as its factorization.

206628505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13055.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 206628505 is about 14374.5784286010. The cubic root of 206628505 is about 591.1940817544.

The spelling of 206628505 in words is "two hundred six million, six hundred twenty-eight thousand, five hundred five".