685492729 has 4 divisors (see below), whose sum is σ = 685973860. Its totient is φ = 685011600.

The previous prime is 685492727. The next prime is 685492741. The reversal of 685492729 is 927294586.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18045504 + 667447225 = 4248^2 + 25835^2 .

It is a cyclic number.

It is not a de Polignac number, because 685492729 - 2¹ = 685492727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685492721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238422 + ... + 241279.

It is an arithmetic number, because the mean of its divisors is an integer number (171493465).

Almost surely, 2^685492729 is an apocalyptic number.

It is an amenable number.

685492729 is a deficient number, since it is larger than the sum of its proper divisors (481131).

685492729 is a wasteful number, since it uses less digits than its factorization.

685492729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481130.

The product of its digits is 2177280, while the sum is 52.

The square root of 685492729 is about 26181.9160681567. The cubic root of 685492729 is about 881.7272930859.

The spelling of 685492729 in words is "six hundred eighty-five million, four hundred ninety-two thousand, seven hundred twenty-nine".