206977688 has 32 divisors (see below), whose sum is σ = 395280000. Its totient is φ = 101587200.

The previous prime is 206977651. The next prime is 206977699. The reversal of 206977688 is 886779602.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 105113 + ... + 107063.

It is an arithmetic number, because the mean of its divisors is an integer number (12352500).

Almost surely, 2^206977688 is an apocalyptic number.

It is an amenable number.

206977688 is a deficient number, since it is larger than the sum of its proper divisors (188302312).

206977688 is a wasteful number, since it uses less digits than its factorization.

206977688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2191 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The square root of 206977688 is about 14386.7191534415. The cubic root of 206977688 is about 591.5269153855.

The spelling of 206977688 in words is "two hundred six million, nine hundred seventy-seven thousand, six hundred eighty-eight".