209488680 has 320 divisors, whose sum is σ = 768398400. Its totient is φ = 51010560.

The previous prime is 209488679. The next prime is 209488681. The reversal of 209488680 is 86884902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (209488679) and next prime (209488681).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209488681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2523919 + ... + 2524001.

It is an arithmetic number, because the mean of its divisors is an integer number (2401245).

Almost surely, 2^209488680 is an apocalyptic number.

209488680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209488680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384199200).

209488680 is an abundant number, since it is smaller than the sum of its proper divisors (558909720).

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

209488680 is a wasteful number, since it uses less digits than its factorization.

209488680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 209488680 is about 14473.7237779363. The cubic root of 209488680 is about 593.9093831771.

The spelling of 209488680 in words is "two hundred nine million, four hundred eighty-eight thousand, six hundred eighty".