685888487 has 4 divisors (see below), whose sum is σ = 686015760. Its totient is φ = 685761216.

The previous prime is 685888403. The next prime is 685888517. The reversal of 685888487 is 784888586.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 685888487 - 2¹² = 685884391 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 (685888387) 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, 55178 + ... + 66455.

It is an arithmetic number, because the mean of its divisors is an integer number (171503940).

Almost surely, 2^685888487 is an apocalyptic number.

685888487 is a deficient number, since it is larger than the sum of its proper divisors (127273).

685888487 is a wasteful number, since it uses less digits than its factorization.

685888487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127272.

The product of its digits is 27525120, while the sum is 62.

The square root of 685888487 is about 26189.4728278368. The cubic root of 685888487 is about 881.8969440456.

Subtracting 685888487 from its reverse (784888586), we obtain a palindrome (99000099).

The spelling of 685888487 in words is "six hundred eighty-five million, eight hundred eighty-eight thousand, four hundred eighty-seven".