209248864 has 24 divisors (see below), whose sum is σ = 449410248. Its totient is φ = 95112960.

The previous prime is 209248813. The next prime is 209248867. The reversal of 209248864 is 468842902.

It is a self number, because there is not a number n which added to its sum of digits gives 209248864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209248867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296877 + ... + 297580.

It is an arithmetic number, because the mean of its divisors is an integer number (18725427).

Almost surely, 2^209248864 is an apocalyptic number.

It is an amenable number.

209248864 is an abundant number, since it is smaller than the sum of its proper divisors (240161384).

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

209248864 is a wasteful number, since it uses less digits than its factorization.

209248864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594478 (or 594470 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 209248864 is about 14465.4368755320. The cubic root of 209248864 is about 593.6826670977.

The spelling of 209248864 in words is "two hundred nine million, two hundred forty-eight thousand, eight hundred sixty-four".