685515406 has 8 divisors (see below), whose sum is σ = 1042359264. Its totient is φ = 338062320.

The previous prime is 685515403. The next prime is 685515407. The reversal of 685515406 is 604515586.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685515401) 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 in 3 ways as a sum of consecutive naturals, for example, 2347510 + ... + 2347801.

It is an arithmetic number, because the mean of its divisors is an integer number (130294908).

Almost surely, 2^685515406 is an apocalyptic number.

685515406 is a deficient number, since it is larger than the sum of its proper divisors (356843858).

685515406 is a wasteful number, since it uses less digits than its factorization.

685515406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695386.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 685515406 is about 26182.3491306643. The cubic root of 685515406 is about 881.7370158778.

The spelling of 685515406 in words is "six hundred eighty-five million, five hundred fifteen thousand, four hundred six".