208421628 has 24 divisors (see below), whose sum is σ = 494291280. Its totient is φ = 68334720.

The previous prime is 208421617. The next prime is 208421651. The reversal of 208421628 is 826124802.

It is a happy number.

208421628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141633 + ... + 143096.

It is an arithmetic number, because the mean of its divisors is an integer number (20595470).

Almost surely, 2^208421628 is an apocalyptic number.

It is an amenable number.

208421628 is an abundant number, since it is smaller than the sum of its proper divisors (285869652).

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

208421628 is a wasteful number, since it uses less digits than its factorization.

208421628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284797 (or 284795 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 208421628 is about 14436.8150227119. The cubic root of 208421628 is about 592.8992868423.

The spelling of 208421628 in words is "two hundred eight million, four hundred twenty-one thousand, six hundred twenty-eight".