209728427202 has 160 divisors (see below), whose sum is σ = 570543861888. Its totient is φ = 56212268544.

The previous prime is 209728427197. The next prime is 209728427203. The reversal of 209728427202 is 202724827902.

It is a super-2 number, since 2×209728427202² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209728427203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5900628 + ... + 5936064.

Almost surely, 2^209728427202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209728427202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285271930944).

209728427202 is an abundant number, since it is smaller than the sum of its proper divisors (360815434686).

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

209728427202 is a wasteful number, since it uses less digits than its factorization.

209728427202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35782 (or 35773 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 209728427202 in words is "two hundred nine billion, seven hundred twenty-eight million, four hundred twenty-seven thousand, two hundred two".