689689690 has 8 divisors (see below), whose sum is σ = 1241441460. Its totient is φ = 275875872.

The previous prime is 689689667. The next prime is 689689697. The reversal of 689689690 is 96986986.

689689690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 683770201 + 5919489 = 26149^2 + 2433^2 .

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

It is a super-2 number, since 2×689689690² = 951343736984592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689689697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34484475 + ... + 34484494.

Almost surely, 2^689689690 is an apocalyptic number.

689689690 is a deficient number, since it is larger than the sum of its proper divisors (551751770).

689689690 is a wasteful number, since it uses less digits than its factorization.

689689690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68968976.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The square root of 689689690 is about 26261.9437589833. The cubic root of 689689690 is about 883.5231051471.

It can be divided in two parts, 6896896 and 90, that added together give a palindrome (6896986).

The spelling of 689689690 in words is "six hundred eighty-nine million, six hundred eighty-nine thousand, six hundred ninety".