648773841 has 4 divisors (see below), whose sum is σ = 865031792. Its totient is φ = 432515892.

The previous prime is 648773837. The next prime is 648773891. The reversal of 648773841 is 148377846.

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 648773841 - 2² = 648773837 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 (648773891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108128971 + ... + 108128976.

It is an arithmetic number, because the mean of its divisors is an integer number (216257948).

Almost surely, 2^648773841 is an apocalyptic number.

It is an amenable number.

648773841 is a deficient number, since it is larger than the sum of its proper divisors (216257951).

648773841 is a wasteful number, since it uses less digits than its factorization.

648773841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216257950.

The product of its digits is 903168, while the sum is 48.

The square root of 648773841 is about 25471.0392603050. The cubic root of 648773841 is about 865.6940717751.

The spelling of 648773841 in words is "six hundred forty-eight million, seven hundred seventy-three thousand, eight hundred forty-one".