685338487 has 4 divisors (see below), whose sum is σ = 687777696. Its totient is φ = 682899280.

The previous prime is 685338473. The next prime is 685338503. The reversal of 685338487 is 784833586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685338487 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 (685338587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219183 + ... + 1219744.

It is an arithmetic number, because the mean of its divisors is an integer number (171944424).

Almost surely, 2^685338487 is an apocalyptic number.

685338487 is a deficient number, since it is larger than the sum of its proper divisors (2439209).

685338487 is a wasteful number, since it uses less digits than its factorization.

685338487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439208.

The product of its digits is 3870720, while the sum is 52.

The square root of 685338487 is about 26178.9703197051. The cubic root of 685338487 is about 881.6611559474.

The spelling of 685338487 in words is "six hundred eighty-five million, three hundred thirty-eight thousand, four hundred eighty-seven".