662128689 has 4 divisors (see below), whose sum is σ = 882838256. Its totient is φ = 441419124.

The previous prime is 662128681. The next prime is 662128741. The reversal of 662128689 is 986821266.

It is a happy number.

662128689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 662128689 - 2³ = 662128681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (662128681) 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, 110354779 + ... + 110354784.

It is an arithmetic number, because the mean of its divisors is an integer number (220709564).

Almost surely, 2^662128689 is an apocalyptic number.

It is an amenable number.

662128689 is a deficient number, since it is larger than the sum of its proper divisors (220709567).

662128689 is a wasteful number, since it uses less digits than its factorization.

662128689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220709566.

The product of its digits is 497664, while the sum is 48.

The square root of 662128689 is about 25731.8613590234. The cubic root of 662128689 is about 871.5938058681.

The spelling of 662128689 in words is "six hundred sixty-two million, one hundred twenty-eight thousand, six hundred eighty-nine".