206688890 has 32 divisors (see below), whose sum is σ = 396394560. Its totient is φ = 77324544.

The previous prime is 206688877. The next prime is 206688899. The reversal of 206688890 is 98886602.

206688890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (206688899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23981 + ... + 31439.

It is an arithmetic number, because the mean of its divisors is an integer number (12387330).

Almost surely, 2^206688890 is an apocalyptic number.

206688890 is a deficient number, since it is larger than the sum of its proper divisors (189705670).

206688890 is a wasteful number, since it uses less digits than its factorization.

206688890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 206688890 is about 14376.6786845919. The cubic root of 206688890 is about 591.2516662225.

The spelling of 206688890 in words is "two hundred six million, six hundred eighty-eight thousand, eight hundred ninety".