206398109288 has 24 divisors (see below), whose sum is σ = 450179550450. Its totient is φ = 88456332384.

The previous prime is 206398109273. The next prime is 206398109293. The reversal of 206398109288 is 882901893602.

It can be written as a sum of positive squares in only one way, i.e., 183970650724 + 22427458564 = 428918^2 + 149758^2 .

It is a super-3 number, since 3×206398109288³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263262503 + ... + 263263286.

Almost surely, 2^206398109288 is an apocalyptic number.

206398109288 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

206398109288 is an abundant number, since it is smaller than the sum of its proper divisors (243781441162).

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

206398109288 is a wasteful number, since it uses less digits than its factorization.

206398109288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526525809 (or 526525798 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 206398109288 in words is "two hundred six billion, three hundred ninety-eight million, one hundred nine thousand, two hundred eighty-eight".