206988681390 has 64 divisors (see below), whose sum is σ = 498096635904. Its totient is φ = 55050087168.

The previous prime is 206988681323. The next prime is 206988681421. The reversal of 206988681390 is 93186889602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19789042 + ... + 19799498.

It is an arithmetic number, because the mean of its divisors is an integer number (7782759936).

Almost surely, 2^206988681390 is an apocalyptic number.

206988681390 is an abundant number, since it is smaller than the sum of its proper divisors (291107954514).

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

206988681390 is a wasteful number, since it uses less digits than its factorization.

206988681390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12161.

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 206988681390 in words is "two hundred six billion, nine hundred eighty-eight million, six hundred eighty-one thousand, three hundred ninety".