685789537 has 8 divisors (see below), whose sum is σ = 728217000. Its totient is φ = 643593984.

The previous prime is 685789519. The next prime is 685789541. The reversal of 685789537 is 735987586.

It can be written as a sum of positive squares in 4 ways, for example, as 409698081 + 276091456 = 20241^2 + 16616^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685789537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685789547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51862 + ... + 63727.

It is an arithmetic number, because the mean of its divisors is an integer number (91027125).

Almost surely, 2^685789537 is an apocalyptic number.

It is an amenable number.

685789537 is a deficient number, since it is larger than the sum of its proper divisors (42427463).

685789537 is a wasteful number, since it uses less digits than its factorization.

685789537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115955.

The product of its digits is 12700800, while the sum is 58.

The square root of 685789537 is about 26187.5836418712. The cubic root of 685789537 is about 881.8545329244.

The spelling of 685789537 in words is "six hundred eighty-five million, seven hundred eighty-nine thousand, five hundred thirty-seven".