689909706 has 24 divisors (see below), whose sum is σ = 1531264644. Its totient is φ = 224360640.

The previous prime is 689909699. The next prime is 689909707. The reversal of 689909706 is 607909986.

It can be written as a sum of positive squares in 2 ways, for example, as 686702025 + 3207681 = 26205^2 + 1791^2 .

It is not an unprimeable number, because it can be changed into a prime (689909707) 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 11 ways as a sum of consecutive naturals, for example, 466681 + ... + 468156.

Almost surely, 2^689909706 is an apocalyptic number.

689909706 is an abundant number, since it is smaller than the sum of its proper divisors (841354938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689909706 is a wasteful number, since it uses less digits than its factorization.

689909706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934886 (or 934883 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 689909706 is about 26266.1322999790. The cubic root of 689909706 is about 883.6170452458.

The spelling of 689909706 in words is "six hundred eighty-nine million, nine hundred nine thousand, seven hundred six".