687276749 has 2 divisors, whose sum is σ = 687276750. Its totient is φ = 687276748.

The previous prime is 687276679. The next prime is 687276761. The reversal of 687276749 is 947672786.

687276749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682515625 + 4761124 = 26125^2 + 2182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687276749 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 687276694 and 687276703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687272749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343638374 + 343638375.

It is an arithmetic number, because the mean of its divisors is an integer number (343638375).

Almost surely, 2^687276749 is an apocalyptic number.

It is an amenable number.

687276749 is a deficient number, since it is larger than the sum of its proper divisors (1).

687276749 is an equidigital number, since it uses as much as digits as its factorization.

687276749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 56.

The square root of 687276749 is about 26215.9636290562. The cubic root of 687276749 is about 882.4915396953.

The spelling of 687276749 in words is "six hundred eighty-seven million, two hundred seventy-six thousand, seven hundred forty-nine".