687107977 has 2 divisors, whose sum is σ = 687107978. Its totient is φ = 687107976.

The previous prime is 687107903. The next prime is 687107983. The reversal of 687107977 is 779701786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397563721 + 289544256 = 19939^2 + 17016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687107977 is a prime.

It is not a weakly prime, because it can be changed into another prime (687107077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343553988 + 343553989.

It is an arithmetic number, because the mean of its divisors is an integer number (343553989).

Almost surely, 2^687107977 is an apocalyptic number.

It is an amenable number.

687107977 is a deficient number, since it is larger than the sum of its proper divisors (1).

687107977 is an equidigital number, since it uses as much as digits as its factorization.

687107977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1037232, while the sum is 52.

The square root of 687107977 is about 26212.7445529841. The cubic root of 687107977 is about 882.4192970577.

The spelling of 687107977 in words is "six hundred eighty-seven million, one hundred seven thousand, nine hundred seventy-seven".