206649988 has 6 divisors (see below), whose sum is σ = 361637486. Its totient is φ = 103324992.

The previous prime is 206649983. The next prime is 206649991. The reversal of 206649988 is 889946602.

It can be written as a sum of positive squares in only one way, i.e., 195944004 + 10705984 = 13998^2 + 3272^2 .

It is not an unprimeable number, because it can be changed into a prime (206649983) 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 as a sum of consecutive naturals, namely, 25831245 + ... + 25831252.

Almost surely, 2^206649988 is an apocalyptic number.

It is an amenable number.

206649988 is a deficient number, since it is larger than the sum of its proper divisors (154987498).

206649988 is a wasteful number, since it uses less digits than its factorization.

206649988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51662501 (or 51662499 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 206649988 is about 14375.3256658762. The cubic root of 206649988 is about 591.2145697026.

The spelling of 206649988 in words is "two hundred six million, six hundred forty-nine thousand, nine hundred eighty-eight".