648385989 has 8 divisors (see below), whose sum is σ = 865385760. Its totient is φ = 431821776.

The previous prime is 648385937. The next prime is 648385993. The reversal of 648385989 is 989583846.

It is a happy number.

648385989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 648385989 - 2⁹ = 648385477 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648385919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105399 + ... + 111380.

It is an arithmetic number, because the mean of its divisors is an integer number (108173220).

Almost surely, 2^648385989 is an apocalyptic number.

It is an amenable number.

648385989 is a deficient number, since it is larger than the sum of its proper divisors (216999771).

648385989 is a wasteful number, since it uses less digits than its factorization.

648385989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217779.

The product of its digits is 14929920, while the sum is 60.

The square root of 648385989 is about 25463.4245340253. The cubic root of 648385989 is about 865.5215267438.

The spelling of 648385989 in words is "six hundred forty-eight million, three hundred eighty-five thousand, nine hundred eighty-nine".