685351647 has 6 divisors (see below), whose sum is σ = 989952392. Its totient is φ = 456901092.

The previous prime is 685351609. The next prime is 685351649. The reversal of 685351647 is 746153586.

685351647 is a `hidden beast` number, since 68 + 535 + 16 + 47 = 666.

It is not a de Polignac number, because 685351647 - 2¹⁰ = 685350623 is a prime.

It is a super-2 number, since 2×685351647² = 939413760091225218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685351649) 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 5 ways as a sum of consecutive naturals, for example, 38075083 + ... + 38075100.

Almost surely, 2^685351647 is an apocalyptic number.

685351647 is a deficient number, since it is larger than the sum of its proper divisors (304600745).

685351647 is a wasteful number, since it uses less digits than its factorization.

685351647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76150189 (or 76150186 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 685351647 is about 26179.2216652826. The cubic root of 685351647 is about 881.6667991863. Note that the first 3 decimals are identical.

The spelling of 685351647 in words is "six hundred eighty-five million, three hundred fifty-one thousand, six hundred forty-seven".