687824387 has 2 divisors, whose sum is σ = 687824388. Its totient is φ = 687824386.

The previous prime is 687824359. The next prime is 687824399. The reversal of 687824387 is 783428786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687824387 - 2¹² = 687820291 is a prime.

It is not a weakly prime, because it can be changed into another prime (687823387) 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, 343912193 + 343912194.

It is an arithmetic number, because the mean of its divisors is an integer number (343912194).

Almost surely, 2^687824387 is an apocalyptic number.

687824387 is a deficient number, since it is larger than the sum of its proper divisors (1).

687824387 is an equidigital number, since it uses as much as digits as its factorization.

687824387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 53.

The square root of 687824387 is about 26226.4062921324. The cubic root of 687824387 is about 882.7258740179.

The spelling of 687824387 in words is "six hundred eighty-seven million, eight hundred twenty-four thousand, three hundred eighty-seven".