688989683 has 2 divisors, whose sum is σ = 688989684. Its totient is φ = 688989682.

The previous prime is 688989671. The next prime is 688989689. The reversal of 688989683 is 386989886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688989683 - 2¹² = 688985587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (688989689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344494841 + 344494842.

It is an arithmetic number, because the mean of its divisors is an integer number (344494842).

Almost surely, 2^688989683 is an apocalyptic number.

688989683 is a deficient number, since it is larger than the sum of its proper divisors (1).

688989683 is an equidigital number, since it uses as much as digits as its factorization.

688989683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35831808, while the sum is 65.

The square root of 688989683 is about 26248.6129728792. The cubic root of 688989683 is about 883.2240906160.

The spelling of 688989683 in words is "six hundred eighty-eight million, nine hundred eighty-nine thousand, six hundred eighty-three".