206645364 has 48 divisors (see below), whose sum is σ = 538171200. Its totient is φ = 68570208.

The previous prime is 206645339. The next prime is 206645399. The reversal of 206645364 is 463546602.

206645364 is a `hidden beast` number, since 2 + 0 + 6 + 645 + 3 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 20302 + ... + 28730.

It is an arithmetic number, because the mean of its divisors is an integer number (11211900).

Almost surely, 2^206645364 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 206645364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269085600).

206645364 is an abundant number, since it is smaller than the sum of its proper divisors (331525836).

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

206645364 is a wasteful number, since it uses less digits than its factorization.

206645364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669 (or 8661 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 206645364 is about 14375.1648338376. The cubic root of 206645364 is about 591.2101599975.

The spelling of 206645364 in words is "two hundred six million, six hundred forty-five thousand, three hundred sixty-four".