209990088 has 192 divisors, whose sum is σ = 724464000. Its totient is φ = 54472320.

The previous prime is 209990029. The next prime is 209990119. The reversal of 209990088 is 880099902.

209990088 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 271270 + ... + 272042.

It is an arithmetic number, because the mean of its divisors is an integer number (3773250).

Almost surely, 2^209990088 is an apocalyptic number.

209990088 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 209990088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362232000).

209990088 is an abundant number, since it is smaller than the sum of its proper divisors (514473912).

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

209990088 is a wasteful number, since it uses less digits than its factorization.

209990088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 796 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 209990088 is about 14491.0347456626. The cubic root of 209990088 is about 594.3828433586.

The spelling of 209990088 in words is "two hundred nine million, nine hundred ninety thousand, eighty-eight".