206861880 has 64 divisors (see below), whose sum is σ = 621878400. Its totient is φ = 55048320.

The previous prime is 206861867. The next prime is 206861891. The reversal of 206861880 is 88168602.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 67011 + ... + 70029.

It is an arithmetic number, because the mean of its divisors is an integer number (9716850).

Almost surely, 2^206861880 is an apocalyptic number.

206861880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206861880 is an abundant number, since it is smaller than the sum of its proper divisors (415016520).

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

206861880 is a wasteful number, since it uses less digits than its factorization.

206861880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604 (or 3600 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 206861880 is about 14382.6937671634. The cubic root of 206861880 is about 591.4165712384.

The spelling of 206861880 in words is "two hundred six million, eight hundred sixty-one thousand, eight hundred eighty".