208661860 has 48 divisors (see below), whose sum is σ = 479328192. Its totient is φ = 75670400.

The previous prime is 208661851. The next prime is 208661867. The reversal of 208661860 is 68166802.

It is not an unprimeable number, because it can be changed into a prime (208661867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96390 + ... + 98530.

It is an arithmetic number, because the mean of its divisors is an integer number (9986004).

Almost surely, 2^208661860 is an apocalyptic number.

208661860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208661860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239664096).

208661860 is an abundant number, since it is smaller than the sum of its proper divisors (270666332).

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

208661860 is a wasteful number, since it uses less digits than its factorization.

208661860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604 (or 2602 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 208661860 is about 14445.1327442845. The cubic root of 208661860 is about 593.1269962436.

The spelling of 208661860 in words is "two hundred eight million, six hundred sixty-one thousand, eight hundred sixty".