208561868 has 12 divisors (see below), whose sum is σ = 373471560. Its totient is φ = 101855712.

The previous prime is 208561849. The next prime is 208561891. The reversal of 208561868 is 868165802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606113 + ... + 606456.

It is an arithmetic number, because the mean of its divisors is an integer number (31122630).

Almost surely, 2^208561868 is an apocalyptic number.

It is an amenable number.

208561868 is a deficient number, since it is larger than the sum of its proper divisors (164909692).

208561868 is a wasteful number, since it uses less digits than its factorization.

208561868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212616 (or 1212614 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 208561868 is about 14441.6712329287. The cubic root of 208561868 is about 593.0322377817.

The spelling of 208561868 in words is "two hundred eight million, five hundred sixty-one thousand, eight hundred sixty-eight".