209671987692 has 48 divisors (see below), whose sum is σ = 489825423360. Its totient is φ = 69806329728.

The previous prime is 209671987633. The next prime is 209671987697. The reversal of 209671987692 is 296789176902.

209671987692 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (209671987697) 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, 55628784 + ... + 55632552.

It is an arithmetic number, because the mean of its divisors is an integer number (10204696320).

Almost surely, 2^209671987692 is an apocalyptic number.

It is an amenable number.

209671987692 is an abundant number, since it is smaller than the sum of its proper divisors (280153435668).

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

209671987692 is a wasteful number, since it uses less digits than its factorization.

209671987692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142 (or 8140 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 66.

The spelling of 209671987692 in words is "two hundred nine billion, six hundred seventy-one million, nine hundred eighty-seven thousand, six hundred ninety-two".