209828680 has 32 divisors (see below), whose sum is σ = 482163840. Its totient is φ = 82144960.

The previous prime is 209828629. The next prime is 209828687. The reversal of 209828680 is 86828902.

It is not an unprimeable number, because it can be changed into a prime (209828687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53926 + ... + 57685.

It is an arithmetic number, because the mean of its divisors is an integer number (15067620).

Almost surely, 2^209828680 is an apocalyptic number.

209828680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209828680 is an abundant number, since it is smaller than the sum of its proper divisors (272335160).

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

209828680 is a wasteful number, since it uses less digits than its factorization.

209828680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111669 (or 111665 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 209828680 is about 14485.4644385329. The cubic root of 209828680 is about 594.2305143635.

The spelling of 209828680 in words is "two hundred nine million, eight hundred twenty-eight thousand, six hundred eighty".