648665290 has 32 divisors (see below), whose sum is σ = 1437045120. Its totient is φ = 205291584.

The previous prime is 648665231. The next prime is 648665291. The reversal of 648665290 is 92566846.

648665290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 648665290.

It is not an unprimeable number, because it can be changed into a prime (648665291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355500 + ... + 357319.

It is an arithmetic number, because the mean of its divisors is an integer number (44907660).

Almost surely, 2^648665290 is an apocalyptic number.

648665290 is an abundant number, since it is smaller than the sum of its proper divisors (788379830).

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

648665290 is a wasteful number, since it uses less digits than its factorization.

648665290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712846.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 648665290 is about 25468.9083001215. The cubic root of 648665290 is about 865.6457872560.

The spelling of 648665290 in words is "six hundred forty-eight million, six hundred sixty-five thousand, two hundred ninety".