206790990 has 64 divisors (see below), whose sum is σ = 568788480. Its totient is φ = 47134080.

The previous prime is 206790989. The next prime is 206791031. The reversal of 206790990 is 99097602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87241 + ... + 89579.

It is an arithmetic number, because the mean of its divisors is an integer number (8887320).

Almost surely, 2^206790990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206790990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284394240).

206790990 is an abundant number, since it is smaller than the sum of its proper divisors (361997490).

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

206790990 is a wasteful number, since it uses less digits than its factorization.

206790990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 206790990 is about 14380.2291358657. The cubic root of 206790990 is about 591.3490055261.

The spelling of 206790990 in words is "two hundred six million, seven hundred ninety thousand, nine hundred ninety".