209231973888 has 320 divisors, whose sum is σ = 672025559040. Its totient is φ = 56510963712.

The previous prime is 209231973887. The next prime is 209231973931. The reversal of 209231973888 is 888379132902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209231973887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132173545 + ... + 132175127.

It is an arithmetic number, because the mean of its divisors is an integer number (2100079872).

Almost surely, 2^209231973888 is an apocalyptic number.

209231973888 is a gapful number since it is divisible by the number (28) 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 209231973888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336012779520).

209231973888 is an abundant number, since it is smaller than the sum of its proper divisors (462793585152).

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

209231973888 is a wasteful number, since it uses less digits than its factorization.

209231973888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2261 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 209231973888 in words is "two hundred nine billion, two hundred thirty-one million, nine hundred seventy-three thousand, eight hundred eighty-eight".