685492489 has 8 divisors (see below), whose sum is σ = 766049760. Its totient is φ = 607975200.

The previous prime is 685492487. The next prime is 685492499. The reversal of 685492489 is 984294586.

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 685492489 - 2¹ = 685492487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685492487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759519 + ... + 760420.

It is an arithmetic number, because the mean of its divisors is an integer number (95756220).

Almost surely, 2^685492489 is an apocalyptic number.

It is an amenable number.

685492489 is a deficient number, since it is larger than the sum of its proper divisors (80557271).

685492489 is a wasteful number, since it uses less digits than its factorization.

685492489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519991.

The product of its digits is 4976640, while the sum is 55.

The square root of 685492489 is about 26181.9114848401. The cubic root of 685492489 is about 881.7271901845.

The spelling of 685492489 in words is "six hundred eighty-five million, four hundred ninety-two thousand, four hundred eighty-nine".