209764368 has 120 divisors (see below), whose sum is σ = 645393216. Its totient is φ = 63072000.

The previous prime is 209764327. The next prime is 209764391. The reversal of 209764368 is 863467902.

209764368 is a `hidden beast` number, since 209 + 7 + 6 + 436 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238746 + ... + 239622.

Almost surely, 2^209764368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209764368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322696608).

209764368 is an abundant number, since it is smaller than the sum of its proper divisors (435628848).

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

209764368 is a wasteful number, since it uses less digits than its factorization.

209764368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 209764368 is about 14483.2443879125. The cubic root of 209764368 is about 594.1697980720.

The spelling of 209764368 in words is "two hundred nine million, seven hundred sixty-four thousand, three hundred sixty-eight".