687946799 has 2 divisors, whose sum is σ = 687946800. Its totient is φ = 687946798.

The previous prime is 687946757. The next prime is 687946807. The reversal of 687946799 is 997649786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687946799 - 2⁸ = 687946543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687946099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343973399 + 343973400.

It is an arithmetic number, because the mean of its divisors is an integer number (343973400).

Almost surely, 2^687946799 is an apocalyptic number.

687946799 is a deficient number, since it is larger than the sum of its proper divisors (1).

687946799 is an equidigital number, since it uses as much as digits as its factorization.

687946799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 65.

The square root of 687946799 is about 26228.7399430472. The cubic root of 687946799 is about 882.7782371075.

The spelling of 687946799 in words is "six hundred eighty-seven million, nine hundred forty-six thousand, seven hundred ninety-nine".