685694737 has 8 divisors (see below), whose sum is σ = 843932096. Its totient is φ = 542527632.

The previous prime is 685694731. The next prime is 685694773. The reversal of 685694737 is 737496586.

It is a happy number.

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 685694737 - 2³ = 685694729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685694731) 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, 3767463 + ... + 3767644.

It is an arithmetic number, because the mean of its divisors is an integer number (105491512).

Almost surely, 2^685694737 is an apocalyptic number.

It is an amenable number.

685694737 is a deficient number, since it is larger than the sum of its proper divisors (158237359).

685694737 is a wasteful number, since it uses less digits than its factorization.

685694737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7535127.

The product of its digits is 7620480, while the sum is 55.

The square root of 685694737 is about 26185.7735612298. The cubic root of 685694737 is about 881.8138967147.

The spelling of 685694737 in words is "six hundred eighty-five million, six hundred ninety-four thousand, seven hundred thirty-seven".