208221804 has 72 divisors (see below), whose sum is σ = 602853888. Its totient is φ = 59361120.

The previous prime is 208221803. The next prime is 208221809. The reversal of 208221804 is 408122802.

208221804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×208221804² = 86712639322028832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208221803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228109 + ... + 229019.

Almost surely, 2^208221804 is an apocalyptic number.

It is an amenable number.

208221804 is an abundant number, since it is smaller than the sum of its proper divisors (394632084).

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

208221804 is a wasteful number, since it uses less digits than its factorization.

208221804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 208221804 is about 14429.8927230940. The cubic root of 208221804 is about 592.7097457485.

The spelling of 208221804 in words is "two hundred eight million, two hundred twenty-one thousand, eight hundred four".