209272506804 has 18 divisors (see below), whose sum is σ = 528994392290. Its totient is φ = 69757502256.

The previous prime is 209272506661. The next prime is 209272506823. The reversal of 209272506804 is 408605272902.

It can be written as a sum of positive squares in only one way, i.e., 207990723600 + 1281783204 = 456060^2 + 35802^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 209272506804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2906562559 + ... + 2906562630.

Almost surely, 2^209272506804 is an apocalyptic number.

It is an amenable number.

209272506804 is an abundant number, since it is smaller than the sum of its proper divisors (319721885486).

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

209272506804 is a wasteful number, since it uses less digits than its factorization.

209272506804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5813125199 (or 5813125194 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 209272506804 in words is "two hundred nine billion, two hundred seventy-two million, five hundred six thousand, eight hundred four".