206641634 has 8 divisors (see below), whose sum is σ = 310057308. Its totient is φ = 103289200.

The previous prime is 206641609. The next prime is 206641639. The reversal of 206641634 is 436146602.

It can be written as a sum of positive squares in 2 ways, for example, as 195916009 + 10725625 = 13997^2 + 3275^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 206641634.

It is not an unprimeable number, because it can be changed into a prime (206641639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6557 + ... + 21360.

Almost surely, 2^206641634 is an apocalyptic number.

206641634 is a deficient number, since it is larger than the sum of its proper divisors (103415674).

206641634 is a wasteful number, since it uses less digits than its factorization.

206641634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31620.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 206641634 is about 14375.0350956093. The cubic root of 206641634 is about 591.2066028128.

The spelling of 206641634 in words is "two hundred six million, six hundred forty-one thousand, six hundred thirty-four".