687448387 has 2 divisors, whose sum is σ = 687448388. Its totient is φ = 687448386.

The previous prime is 687448361. The next prime is 687448417. The reversal of 687448387 is 783844786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687448387 is a prime.

It is not a weakly prime, because it can be changed into another prime (687448337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343724193 + 343724194.

It is an arithmetic number, because the mean of its divisors is an integer number (343724194).

Almost surely, 2^687448387 is an apocalyptic number.

687448387 is a deficient number, since it is larger than the sum of its proper divisors (1).

687448387 is an equidigital number, since it uses as much as digits as its factorization.

687448387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7225344, while the sum is 55.

The square root of 687448387 is about 26219.2369644885. The cubic root of 687448387 is about 882.5649969917.

The spelling of 687448387 in words is "six hundred eighty-seven million, four hundred forty-eight thousand, three hundred eighty-seven".