689256609 has 16 divisors (see below), whose sum is σ = 948352320. Its totient is φ = 444951360.

The previous prime is 689256577. The next prime is 689256637. The reversal of 689256609 is 906652986.

It is not a de Polignac number, because 689256609 - 2⁵ = 689256577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689256209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8707 + ... + 38135.

It is an arithmetic number, because the mean of its divisors is an integer number (59272020).

Almost surely, 2^689256609 is an apocalyptic number.

It is an amenable number.

689256609 is a deficient number, since it is larger than the sum of its proper divisors (259095711).

689256609 is a wasteful number, since it uses less digits than its factorization.

689256609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29680.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 689256609 is about 26253.6970539389. The cubic root of 689256609 is about 883.3381344306.

The spelling of 689256609 in words is "six hundred eighty-nine million, two hundred fifty-six thousand, six hundred nine".