648677217 has 4 divisors (see below), whose sum is σ = 864902960. Its totient is φ = 432451476.

The previous prime is 648677207. The next prime is 648677251. The reversal of 648677217 is 712776846.

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 648677217 - 2⁶ = 648677153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648677207) 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, 108112867 + ... + 108112872.

It is an arithmetic number, because the mean of its divisors is an integer number (216225740).

Almost surely, 2^648677217 is an apocalyptic number.

It is an amenable number.

648677217 is a deficient number, since it is larger than the sum of its proper divisors (216225743).

648677217 is a wasteful number, since it uses less digits than its factorization.

648677217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216225742.

The product of its digits is 790272, while the sum is 48.

The square root of 648677217 is about 25469.1424472831. The cubic root of 648677217 is about 865.6510927626.

The spelling of 648677217 in words is "six hundred forty-eight million, six hundred seventy-seven thousand, two hundred seventeen".