209288972288 has 108 divisors (see below), whose sum is σ = 460478544435. Its totient is φ = 95027834880.

The previous prime is 209288972257. The next prime is 209288972339. The reversal of 209288972288 is 882279882902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 104644486144 + 104644486144 = 323488^2 + 323488^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=323488.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 227735093 + ... + 227736011.

Almost surely, 2^209288972288 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 209288972288

209288972288 is an abundant number, since it is smaller than the sum of its proper divisors (251189572147).

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

209288972288 is an frugal number, since it uses more digits than its factorization.

209288972288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 65.

The spelling of 209288972288 in words is "two hundred nine billion, two hundred eighty-eight million, nine hundred seventy-two thousand, two hundred eighty-eight".