685800799 has 4 divisors (see below), whose sum is σ = 685866040. Its totient is φ = 685735560.

The previous prime is 685800751. The next prime is 685800827. The reversal of 685800799 is 997008586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 685800799 - 2⁹ = 685800287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685800749) 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 in 3 ways as a sum of consecutive naturals, for example, 12864 + ... + 39205.

It is an arithmetic number, because the mean of its divisors is an integer number (171466510).

Almost surely, 2^685800799 is an apocalyptic number.

685800799 is a deficient number, since it is larger than the sum of its proper divisors (65241).

685800799 is a wasteful number, since it uses less digits than its factorization.

685800799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65240.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 685800799 is about 26187.7986665546. The cubic root of 685800799 is about 881.8593601543.

The spelling of 685800799 in words is "six hundred eighty-five million, eight hundred thousand, seven hundred ninety-nine".