687563677 has 2 divisors, whose sum is σ = 687563678. Its totient is φ = 687563676.

The previous prime is 687563671. The next prime is 687563683. The reversal of 687563677 is 776365786.

It is a balanced prime because it is at equal distance from previous prime (687563671) and next prime (687563683).

It can be written as a sum of positive squares in only one way, i.e., 612117081 + 75446596 = 24741^2 + 8686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687563677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687563671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343781838 + 343781839.

It is an arithmetic number, because the mean of its divisors is an integer number (343781839).

Almost surely, 2^687563677 is an apocalyptic number.

It is an amenable number.

687563677 is a deficient number, since it is larger than the sum of its proper divisors (1).

687563677 is an equidigital number, since it uses as much as digits as its factorization.

687563677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 55.

The square root of 687563677 is about 26221.4354488842. The cubic root of 687563677 is about 882.6143317165.

The spelling of 687563677 in words is "six hundred eighty-seven million, five hundred sixty-three thousand, six hundred seventy-seven".