206790978 has 8 divisors (see below), whose sum is σ = 413581968. Its totient is φ = 68930324.

The previous prime is 206790971. The next prime is 206790989. The reversal of 206790978 is 879097602.

It is a sphenic number, since it is the product of 3 distinct primes.

206790978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206790971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17232576 + ... + 17232587.

It is an arithmetic number, because the mean of its divisors is an integer number (51697746).

Almost surely, 2^206790978 is an apocalyptic number.

206790978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

206790978 is a wasteful number, since it uses less digits than its factorization.

206790978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34465168.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 206790978 is about 14380.2287186261. The cubic root of 206790978 is about 591.3489940875.

The spelling of 206790978 in words is "two hundred six million, seven hundred ninety thousand, nine hundred seventy-eight".