689420090 has 8 divisors (see below), whose sum is σ = 1240956180. Its totient is φ = 275768032.

The previous prime is 689420071. The next prime is 689420107. The reversal of 689420090 is 90024986.

It can be written as a sum of positive squares in 2 ways, for example, as 674388961 + 15031129 = 25969^2 + 3877^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 34470995 + ... + 34471014.

Almost surely, 2^689420090 is an apocalyptic number.

689420090 is a deficient number, since it is larger than the sum of its proper divisors (551536090).

689420090 is a wasteful number, since it uses less digits than its factorization.

689420090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68942016.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 689420090 is about 26256.8103546489. The cubic root of 689420090 is about 883.4079669545.

The spelling of 689420090 in words is "six hundred eighty-nine million, four hundred twenty thousand, ninety".