687674737 has 2 divisors, whose sum is σ = 687674738. Its totient is φ = 687674736.

The previous prime is 687674707. The next prime is 687674747. The reversal of 687674737 is 737476786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498227041 + 189447696 = 22321^2 + 13764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687674737 is a prime.

It is not a weakly prime, because it can be changed into another prime (687674707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343837368 + 343837369.

It is an arithmetic number, because the mean of its divisors is an integer number (343837369).

Almost surely, 2^687674737 is an apocalyptic number.

It is an amenable number.

687674737 is a deficient number, since it is larger than the sum of its proper divisors (1).

687674737 is an equidigital number, since it uses as much as digits as its factorization.

687674737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8297856, while the sum is 55.

The square root of 687674737 is about 26223.5530964055. The cubic root of 687674737 is about 882.6618511311.

The spelling of 687674737 in words is "six hundred eighty-seven million, six hundred seventy-four thousand, seven hundred thirty-seven".