208612290 has 64 divisors (see below), whose sum is σ = 517804416. Its totient is φ = 53747712.

The previous prime is 208612241. The next prime is 208612291. The reversal of 208612290 is 92216802.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (208612291) 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, 180354 + ... + 181506.

It is an arithmetic number, because the mean of its divisors is an integer number (8090694).

Almost surely, 2^208612290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208612290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258902208).

208612290 is an abundant number, since it is smaller than the sum of its proper divisors (309192126).

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

208612290 is a wasteful number, since it uses less digits than its factorization.

208612290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 208612290 is about 14443.4168395155. The cubic root of 208612290 is about 593.0800245007.

The spelling of 208612290 in words is "two hundred eight million, six hundred twelve thousand, two hundred ninety".