209223648 has 120 divisors (see below), whose sum is σ = 627342408. Its totient is φ = 68380416.

The previous prime is 209223631. The next prime is 209223683. The reversal of 209223648 is 846322902.

209223648 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 2 + 3 + 648 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 13.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 136615 + ... + 138137.

Almost surely, 2^209223648 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 209223648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313671204).

209223648 is an abundant number, since it is smaller than the sum of its proper divisors (418118760).

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

209223648 is a wasteful number, since it uses less digits than its factorization.

209223648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598 (or 1581 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 209223648 is about 14464.5652544416. The cubic root of 209223648 is about 593.6588184561.

The spelling of 209223648 in words is "two hundred nine million, two hundred twenty-three thousand, six hundred forty-eight".