206917790828 has 24 divisors (see below), whose sum is σ = 414222765600. Its totient is φ = 88596085248.

The previous prime is 206917790819. The next prime is 206917790839. The reversal of 206917790828 is 828097719602.

It is a super-2 number, since 2×206917790828² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 3426533 + ... + 3486396.

It is an arithmetic number, because the mean of its divisors is an integer number (17259281900).

Almost surely, 2^206917790828 is an apocalyptic number.

206917790828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

206917790828 is an abundant number, since it is smaller than the sum of its proper divisors (207304974772).

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

206917790828 is a wasteful number, since it uses less digits than its factorization.

206917790828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6914009 (or 6914007 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 206917790828 in words is "two hundred six billion, nine hundred seventeen million, seven hundred ninety thousand, eight hundred twenty-eight".