209354084828 has 24 divisors (see below), whose sum is σ = 421518300000. Its totient is φ = 89121008448.

The previous prime is 209354084803. The next prime is 209354084837. The reversal of 209354084828 is 828480453902.

It is a self number, because there is not a number n which added to its sum of digits gives 209354084828.

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, 25086203 + ... + 25094546.

It is an arithmetic number, because the mean of its divisors is an integer number (17563262500).

Almost surely, 2^209354084828 is an apocalyptic number.

209354084828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209354084828 is an abundant number, since it is smaller than the sum of its proper divisors (212164215172).

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

209354084828 is a wasteful number, since it uses less digits than its factorization.

209354084828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50180909 (or 50180907 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 209354084828 in words is "two hundred nine billion, three hundred fifty-four million, eighty-four thousand, eight hundred twenty-eight".