689780668 has 12 divisors (see below), whose sum is σ = 1207573920. Its totient is φ = 344759552.

The previous prime is 689780657. The next prime is 689780669. The reversal of 689780668 is 866087986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689780669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20308 + ... + 42331.

It is an arithmetic number, because the mean of its divisors is an integer number (100631160).

Almost surely, 2^689780668 is an apocalyptic number.

It is an amenable number.

689780668 is a deficient number, since it is larger than the sum of its proper divisors (517793252).

689780668 is a wasteful number, since it uses less digits than its factorization.

689780668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65396 (or 65394 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 58.

The square root of 689780668 is about 26263.6758280329. The cubic root of 689780668 is about 883.5619523911.

The spelling of 689780668 in words is "six hundred eighty-nine million, seven hundred eighty thousand, six hundred sixty-eight".