208971928 has 72 divisors (see below), whose sum is σ = 453603780. Its totient is φ = 89501280.

The previous prime is 208971901. The next prime is 208971949. The reversal of 208971928 is 829179802.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3118951 + ... + 3119017.

Almost surely, 2^208971928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208971928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226801890).

208971928 is an abundant number, since it is smaller than the sum of its proper divisors (244631852).

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

208971928 is a wasteful number, since it uses less digits than its factorization.

208971928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 208971928 is about 14455.8613717758. The cubic root of 208971928 is about 593.4206430733.

The spelling of 208971928 in words is "two hundred eight million, nine hundred seventy-one thousand, nine hundred twenty-eight".