208991064 has 64 divisors (see below), whose sum is σ = 577290240. Its totient is φ = 62712320.

The previous prime is 208991033. The next prime is 208991099. The reversal of 208991064 is 460199802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1752 + ... + 20519.

It is an arithmetic number, because the mean of its divisors is an integer number (9020160).

Almost surely, 2^208991064 is an apocalyptic number.

208991064 is a gapful number since it is divisible by the number (24) 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 208991064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288645120).

208991064 is an abundant number, since it is smaller than the sum of its proper divisors (368299176).

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

208991064 is a wasteful number, since it uses less digits than its factorization.

208991064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22320 (or 22316 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 208991064 is about 14456.5232334749. The cubic root of 208991064 is about 593.4387561135.

The spelling of 208991064 in words is "two hundred eight million, nine hundred ninety-one thousand, sixty-four".