208880865 has 24 divisors (see below), whose sum is σ = 364501800. Its totient is φ = 110651904.

The previous prime is 208880857. The next prime is 208880891. The reversal of 208880865 is 568088802.

It can be written as a sum of positive squares in 4 ways, for example, as 136161 + 208744704 = 369^2 + 14448^2 .

It is not a de Polignac number, because 208880865 - 2³ = 208880857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 208880865.

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 23 ways as a sum of consecutive naturals, for example, 8872 + ... + 22281.

It is an arithmetic number, because the mean of its divisors is an integer number (15187575).

Almost surely, 2^208880865 is an apocalyptic number.

It is an amenable number.

208880865 is a deficient number, since it is larger than the sum of its proper divisors (155620935).

208880865 is a wasteful number, since it uses less digits than its factorization.

208880865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31313 (or 31310 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 208880865 is about 14452.7113373235. The cubic root of 208880865 is about 593.3344329049.

The spelling of 208880865 in words is "two hundred eight million, eight hundred eighty thousand, eight hundred sixty-five".