689739646 has 16 divisors (see below), whose sum is σ = 1079003520. Its totient is φ = 330301440.

The previous prime is 689739643. The next prime is 689739671. The reversal of 689739646 is 646937986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689739641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51331 + ... + 63358.

It is an arithmetic number, because the mean of its divisors is an integer number (67437720).

Almost surely, 2^689739646 is an apocalyptic number.

689739646 is a deficient number, since it is larger than the sum of its proper divisors (389263874).

689739646 is a wasteful number, since it uses less digits than its factorization.

689739646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114819.

The product of its digits is 11757312, while the sum is 58.

The square root of 689739646 is about 26262.8948518628. The cubic root of 689739646 is about 883.5444365832.

The spelling of 689739646 in words is "six hundred eighty-nine million, seven hundred thirty-nine thousand, six hundred forty-six".