208639064 has 8 divisors (see below), whose sum is σ = 391198260. Its totient is φ = 104319528.

The previous prime is 208639061. The next prime is 208639073. The reversal of 208639064 is 460936802.

208639064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208639061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13039934 + ... + 13039949.

Almost surely, 2^208639064 is an apocalyptic number.

It is an amenable number.

208639064 is a deficient number, since it is larger than the sum of its proper divisors (182559196).

208639064 is a wasteful number, since it uses less digits than its factorization.

208639064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26079889 (or 26079885 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 208639064 is about 14444.3436680245. The cubic root of 208639064 is about 593.1053960409.

The spelling of 208639064 in words is "two hundred eight million, six hundred thirty-nine thousand, sixty-four".