208609090 has 16 divisors (see below), whose sum is σ = 375736320. Its totient is φ = 83390320.

The previous prime is 208609003. The next prime is 208609097. The reversal of 208609090 is 90906802.

It is not an unprimeable number, because it can be changed into a prime (208609097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12351 + ... + 23869.

It is an arithmetic number, because the mean of its divisors is an integer number (23483520).

Almost surely, 2^208609090 is an apocalyptic number.

208609090 is a deficient number, since it is larger than the sum of its proper divisors (167127230).

208609090 is a wasteful number, since it uses less digits than its factorization.

208609090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 208609090 is about 14443.3060619790. The cubic root of 208609090 is about 593.0769919759.

The spelling of 208609090 in words is "two hundred eight million, six hundred nine thousand, ninety".