209998680 has 64 divisors (see below), whose sum is σ = 647036640. Its totient is φ = 54484992.

The previous prime is 209998673. The next prime is 209998699. The reversal of 209998680 is 86899902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19209 + ... + 28088.

Almost surely, 2^209998680 is an apocalyptic number.

209998680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209998680 is an abundant number, since it is smaller than the sum of its proper divisors (437037960).

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

209998680 is a wasteful number, since it uses less digits than its factorization.

209998680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47348 (or 47344 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 209998680 is about 14491.3312017910. The cubic root of 209998680 is about 594.3909498805.

The spelling of 209998680 in words is "two hundred nine million, nine hundred ninety-eight thousand, six hundred eighty".