208419920828 has 18 divisors (see below), whose sum is σ = 424283410656. Its totient is φ = 89322823128.

The previous prime is 208419920827. The next prime is 208419920833. The reversal of 208419920828 is 828029914802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 208419920828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208419920827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 531683276 + ... + 531683667.

It is an arithmetic number, because the mean of its divisors is an integer number (23571300592).

Almost surely, 2^208419920828 is an apocalyptic number.

208419920828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

208419920828 is an abundant number, since it is smaller than the sum of its proper divisors (215863489828).

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

208419920828 is a wasteful number, since it uses less digits than its factorization.

208419920828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063366961 (or 1063366952 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 208419920828 in words is "two hundred eight billion, four hundred nineteen million, nine hundred twenty thousand, eight hundred twenty-eight".