684088813 has 8 divisors (see below), whose sum is σ = 705894840. Its totient is φ = 662526720.

The previous prime is 684088781. The next prime is 684088829. The reversal of 684088813 is 318880486.

It can be written as a sum of positive squares in 4 ways, for example, as 24780484 + 659308329 = 4978^2 + 25677^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684088813 - 2⁵ = 684088781 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 (684085813) 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 7 ways as a sum of consecutive naturals, for example, 55278 + ... + 66511.

It is an arithmetic number, because the mean of its divisors is an integer number (88236855).

Almost surely, 2^684088813 is an apocalyptic number.

It is an amenable number.

684088813 is a deficient number, since it is larger than the sum of its proper divisors (21806027).

684088813 is a wasteful number, since it uses less digits than its factorization.

684088813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121967.

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 684088813 is about 26155.0915310958. The cubic root of 684088813 is about 881.1249443255.

The spelling of 684088813 in words is "six hundred eighty-four million, eighty-eight thousand, eight hundred thirteen".