648789745 has 4 divisors (see below), whose sum is σ = 778547700. Its totient is φ = 519031792.

The previous prime is 648789737. The next prime is 648789803. The reversal of 648789745 is 547987846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185722384 + 463067361 = 13628^2 + 21519^2 .

It is a cyclic number.

It is not a de Polignac number, because 648789745 - 2³ = 648789737 is a prime.

It is a Smith number, since the sum of its digits (58) 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 648789745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64878970 + ... + 64878979.

It is an arithmetic number, because the mean of its divisors is an integer number (194636925).

Almost surely, 2^648789745 is an apocalyptic number.

It is an amenable number.

648789745 is a deficient number, since it is larger than the sum of its proper divisors (129757955).

648789745 is a wasteful number, since it uses less digits than its factorization.

648789745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129757954.

The product of its digits is 13547520, while the sum is 58.

The square root of 648789745 is about 25471.3514560967. The cubic root of 648789745 is about 865.7011455734.

The spelling of 648789745 in words is "six hundred forty-eight million, seven hundred eighty-nine thousand, seven hundred forty-five".