206491688 has 32 divisors (see below), whose sum is σ = 417768960. Its totient is φ = 95117760.

The previous prime is 206491679. The next prime is 206491693. The reversal of 206491688 is 886194602.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 61493 + ... + 64763.

It is an arithmetic number, because the mean of its divisors is an integer number (13055280).

Almost surely, 2^206491688 is an apocalyptic number.

It is an amenable number.

206491688 is an abundant number, since it is smaller than the sum of its proper divisors (211277272).

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

206491688 is a wasteful number, since it uses less digits than its factorization.

206491688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897 (or 3893 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 206491688 is about 14369.8186488209. The cubic root of 206491688 is about 591.0635685261.

The spelling of 206491688 in words is "two hundred six million, four hundred ninety-one thousand, six hundred eighty-eight".