209734768 has 20 divisors (see below), whose sum is σ = 427749160. Its totient is φ = 99347904.

The previous prime is 209734751. The next prime is 209734771. The reversal of 209734768 is 867437902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344655 + ... + 345262.

It is an arithmetic number, because the mean of its divisors is an integer number (21387458).

Almost surely, 2^209734768 is an apocalyptic number.

It is an amenable number.

209734768 is an abundant number, since it is smaller than the sum of its proper divisors (218014392).

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

209734768 is a wasteful number, since it uses less digits than its factorization.

209734768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689944 (or 689938 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 209734768 is about 14482.2224813735. Note that the first 3 decimals coincide. The cubic root of 209734768 is about 594.1418488489.

The spelling of 209734768 in words is "two hundred nine million, seven hundred thirty-four thousand, seven hundred sixty-eight".