208478840 has 64 divisors (see below), whose sum is σ = 482578560. Its totient is φ = 81018880.

The previous prime is 208478833. The next prime is 208478861. The reversal of 208478840 is 48874802.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 324920 + ... + 325560.

It is an arithmetic number, because the mean of its divisors is an integer number (7540290).

Almost surely, 2^208478840 is an apocalyptic number.

208478840 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 208478840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241289280).

208478840 is an abundant number, since it is smaller than the sum of its proper divisors (274099720).

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

208478840 is a wasteful number, since it uses less digits than its factorization.

208478840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 208478840 is about 14438.7963487266. The cubic root of 208478840 is about 592.9535324133.

The spelling of 208478840 in words is "two hundred eight million, four hundred seventy-eight thousand, eight hundred forty".