689728349 has 8 divisors (see below), whose sum is σ = 705348000. Its totient is φ = 674239792.

The previous prime is 689728343. The next prime is 689728357. The reversal of 689728349 is 943827986.

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 689728349 - 2⁸ = 689728093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689728294 and 689728303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689728343) 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, 22094 + ... + 43215.

It is an arithmetic number, because the mean of its divisors is an integer number (88168500).

Almost surely, 2^689728349 is an apocalyptic number.

It is an amenable number.

689728349 is a deficient number, since it is larger than the sum of its proper divisors (15619651).

689728349 is a wasteful number, since it uses less digits than its factorization.

689728349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65547.

The product of its digits is 5225472, while the sum is 56.

The square root of 689728349 is about 26262.6797756817. The cubic root of 689728349 is about 883.5396128037.

The spelling of 689728349 in words is "six hundred eighty-nine million, seven hundred twenty-eight thousand, three hundred forty-nine".