685415789 has 8 divisors (see below), whose sum is σ = 693810360. Its totient is φ = 677036800.

The previous prime is 685415777. The next prime is 685415791. The reversal of 685415789 is 987514586.

It can be written as a sum of positive squares in 4 ways, for example, as 304502500 + 380913289 = 17450^2 + 19517^2 .

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 685415789 - 2¹² = 685411693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685415789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685415719) 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, 101849 + ... + 108369.

It is an arithmetic number, because the mean of its divisors is an integer number (86726295).

Almost surely, 2^685415789 is an apocalyptic number.

It is an amenable number.

685415789 is a deficient number, since it is larger than the sum of its proper divisors (8394571).

685415789 is a wasteful number, since it uses less digits than its factorization.

685415789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7791.

The product of its digits is 2419200, while the sum is 53.

The square root of 685415789 is about 26180.4466921403. The cubic root of 685415789 is about 881.6943033676.

The spelling of 685415789 in words is "six hundred eighty-five million, four hundred fifteen thousand, seven hundred eighty-nine".