648874805 has 4 divisors (see below), whose sum is σ = 778649772. Its totient is φ = 519099840.

The previous prime is 648874799. The next prime is 648874817. The reversal of 648874805 is 508478846.

648874805 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 an emirpimes, since its reverse is a distinct semiprime: 508478846 = 2 ⋅254239423.

It can be written as a sum of positive squares in 2 ways, for example, as 333208516 + 315666289 = 18254^2 + 17767^2 .

It is not a de Polignac number, because 648874805 - 2⁴ = 648874789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64887476 + ... + 64887485.

It is an arithmetic number, because the mean of its divisors is an integer number (194662443).

Almost surely, 2^648874805 is an apocalyptic number.

It is an amenable number.

648874805 is a deficient number, since it is larger than the sum of its proper divisors (129774967).

648874805 is a wasteful number, since it uses less digits than its factorization.

648874805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129774966.

The product of its (nonzero) digits is 1720320, while the sum is 50.

The square root of 648874805 is about 25473.0211203932. The cubic root of 648874805 is about 865.7389766901.

The spelling of 648874805 in words is "six hundred forty-eight million, eight hundred seventy-four thousand, eight hundred five".