208190664 has 144 divisors (see below), whose sum is σ = 647337600. Its totient is φ = 60287040.

The previous prime is 208190663. The next prime is 208190693. The reversal of 208190664 is 466091802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (208190663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 199857 + ... + 200895.

It is an arithmetic number, because the mean of its divisors is an integer number (4495400).

Almost surely, 2^208190664 is an apocalyptic number.

208190664 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 208190664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323668800).

208190664 is an abundant number, since it is smaller than the sum of its proper divisors (439146936).

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

208190664 is a wasteful number, since it uses less digits than its factorization.

208190664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 208190664 is about 14428.8136726482. The cubic root of 208190664 is about 592.6801972873.

The spelling of 208190664 in words is "two hundred eight million, one hundred ninety thousand, six hundred sixty-four".