689071649 has 8 divisors (see below), whose sum is σ = 789591360. Its totient is φ = 589072176.

The previous prime is 689071633. The next prime is 689071657. The reversal of 689071649 is 946170986.

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

It is not a de Polignac number, because 689071649 - 2⁴ = 689071633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689071597 and 689071606.

It is not an unprimeable number, because it can be changed into a prime (689071619) 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, 127214 + ... + 132519.

It is an arithmetic number, because the mean of its divisors is an integer number (98698920).

Almost surely, 2^689071649 is an apocalyptic number.

It is an amenable number.

689071649 is a deficient number, since it is larger than the sum of its proper divisors (100519711).

689071649 is a wasteful number, since it uses less digits than its factorization.

689071649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260119.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 689071649 is about 26250.1742660882. The cubic root of 689071649 is about 883.2591136248.

The spelling of 689071649 in words is "six hundred eighty-nine million, seventy-one thousand, six hundred forty-nine".