689985767 has 2 divisors, whose sum is σ = 689985768. Its totient is φ = 689985766.

The previous prime is 689985757. The next prime is 689985787. The reversal of 689985767 is 767589986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689985767 - 2¹² = 689981671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689985727) by changing a digit.

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 as a sum of consecutive naturals, namely, 344992883 + 344992884.

It is an arithmetic number, because the mean of its divisors is an integer number (344992884).

Almost surely, 2^689985767 is an apocalyptic number.

689985767 is a deficient number, since it is larger than the sum of its proper divisors (1).

689985767 is an equidigital number, since it uses as much as digits as its factorization.

689985767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 65.

The square root of 689985767 is about 26267.5801512054. The cubic root of 689985767 is about 883.6495163193.

The spelling of 689985767 in words is "six hundred eighty-nine million, nine hundred eighty-five thousand, seven hundred sixty-seven".