208639066 has 8 divisors (see below), whose sum is σ = 315997344. Its totient is φ = 103306620.

The previous prime is 208639061. The next prime is 208639073. The reversal of 208639066 is 660936802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×208639066² = 87060519722704712, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 506200 + ... + 506611.

It is an arithmetic number, because the mean of its divisors is an integer number (39499668).

Almost surely, 2^208639066 is an apocalyptic number.

208639066 is a deficient number, since it is larger than the sum of its proper divisors (107358278).

208639066 is a wasteful number, since it uses less digits than its factorization.

208639066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012916.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 208639066 is about 14444.3437372558. The cubic root of 208639066 is about 593.1053979360.

It can be divided in two parts, 20863 and 9066, that added together give a square (29929 = 173²).

The spelling of 208639066 in words is "two hundred eight million, six hundred thirty-nine thousand, sixty-six".