209248728 has 32 divisors (see below), whose sum is σ = 563362800. Its totient is φ = 64384128.

The previous prime is 209248693. The next prime is 209248757. The reversal of 209248728 is 827842902.

209248728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 209248728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335023 + ... + 335646.

Almost surely, 2^209248728 is an apocalyptic number.

It is an amenable number.

209248728 is an abundant number, since it is smaller than the sum of its proper divisors (354114072).

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

209248728 is a wasteful number, since it uses less digits than its factorization.

209248728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670691 (or 670687 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 209248728 is about 14465.4321746708. The cubic root of 209248728 is about 593.6825384775.

The spelling of 209248728 in words is "two hundred nine million, two hundred forty-eight thousand, seven hundred twenty-eight".