687616247 has 2 divisors, whose sum is σ = 687616248. Its totient is φ = 687616246.

The previous prime is 687616231. The next prime is 687616253. The reversal of 687616247 is 742616786.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687616247 - 2⁴ = 687616231 is a prime.

It is a super-2 number, since 2×687616247² = 945632206276730018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687616297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343808123 + 343808124.

It is an arithmetic number, because the mean of its divisors is an integer number (343808124).

Almost surely, 2^687616247 is an apocalyptic number.

687616247 is a deficient number, since it is larger than the sum of its proper divisors (1).

687616247 is an equidigital number, since it uses as much as digits as its factorization.

687616247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 687616247 is about 26222.4378538686. The cubic root of 687616247 is about 882.6368255618.

The spelling of 687616247 in words is "six hundred eighty-seven million, six hundred sixteen thousand, two hundred forty-seven".