208642818 has 16 divisors (see below), whose sum is σ = 417679200. Its totient is φ = 69482016.

The previous prime is 208642813. The next prime is 208642859. The reversal of 208642818 is 818246802.

It is a super-4 number, since 4×208642818⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (208642813) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9268 + ... + 22431.

It is an arithmetic number, because the mean of its divisors is an integer number (26104950).

Almost surely, 2^208642818 is an apocalyptic number.

208642818 is an abundant number, since it is smaller than the sum of its proper divisors (209036382).

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

208642818 is a wasteful number, since it uses less digits than its factorization.

208642818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32801.

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 208642818 is about 14444.4736145005. The cubic root of 208642818 is about 593.1089532275.

The spelling of 208642818 in words is "two hundred eight million, six hundred forty-two thousand, eight hundred eighteen".