209802320992 has 96 divisors (see below), whose sum is σ = 462456618624. Its totient is φ = 92868249600.

The previous prime is 209802320969. The next prime is 209802320993. The reversal of 209802320992 is 299023208902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209802320993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5080267 + ... + 5121397.

It is an arithmetic number, because the mean of its divisors is an integer number (4817256444).

Almost surely, 2^209802320992 is an apocalyptic number.

209802320992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209802320992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231228309312).

209802320992 is an abundant number, since it is smaller than the sum of its proper divisors (252654297632).

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

209802320992 is a wasteful number, since it uses less digits than its factorization.

209802320992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41532 (or 41524 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 209802320992 in words is "two hundred nine billion, eight hundred two million, three hundred twenty thousand, nine hundred ninety-two".