687674747 has 2 divisors, whose sum is σ = 687674748. Its totient is φ = 687674746.

The previous prime is 687674737. The next prime is 687674749. The reversal of 687674747 is 747476786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687674747 - 2¹² = 687670651 is a prime.

Together with 687674749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 687674692 and 687674701.

It is not a weakly prime, because it can be changed into another prime (687674749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343837373 + 343837374.

It is an arithmetic number, because the mean of its divisors is an integer number (343837374).

Almost surely, 2^687674747 is an apocalyptic number.

687674747 is a deficient number, since it is larger than the sum of its proper divisors (1).

687674747 is an equidigital number, since it uses as much as digits as its factorization.

687674747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11063808, while the sum is 56.

The square root of 687674747 is about 26223.5532870738. The cubic root of 687674747 is about 882.6618554096.

The spelling of 687674747 in words is "six hundred eighty-seven million, six hundred seventy-four thousand, seven hundred forty-seven".