208680813 has 32 divisors (see below), whose sum is σ = 342328320. Its totient is φ = 124573680.

The previous prime is 208680803. The next prime is 208680821. The reversal of 208680813 is 318086802.

It is not a de Polignac number, because 208680813 - 2⁶ = 208680749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208680803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14656 + ... + 25142.

It is an arithmetic number, because the mean of its divisors is an integer number (10697760).

Almost surely, 2^208680813 is an apocalyptic number.

It is an amenable number.

208680813 is a deficient number, since it is larger than the sum of its proper divisors (133647507).

208680813 is a wasteful number, since it uses less digits than its factorization.

208680813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10574 (or 10568 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 208680813 is about 14445.7887635117. The cubic root of 208680813 is about 593.1449538387.

The spelling of 208680813 in words is "two hundred eight million, six hundred eighty thousand, eight hundred thirteen".