206878761 has 6 divisors (see below), whose sum is σ = 298824890. Its totient is φ = 137919168.

The previous prime is 206878759. The next prime is 206878811. The reversal of 206878761 is 167878602.

It can be written as a sum of positive squares in only one way, i.e., 169130025 + 37748736 = 13005^2 + 6144^2 .

It is not a de Polignac number, because 206878761 - 2¹ = 206878759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206878361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11493256 + ... + 11493273.

Almost surely, 2^206878761 is an apocalyptic number.

It is an amenable number.

206878761 is a deficient number, since it is larger than the sum of its proper divisors (91946129).

206878761 is a wasteful number, since it uses less digits than its factorization.

206878761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986535 (or 22986532 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 206878761 is about 14383.2806063151. The cubic root of 206878761 is about 591.4326583519.

The spelling of 206878761 in words is "two hundred six million, eight hundred seventy-eight thousand, seven hundred sixty-one".