648559679 has 4 divisors (see below), whose sum is σ = 651251040. Its totient is φ = 645868320.

The previous prime is 648559651. The next prime is 648559687. The reversal of 648559679 is 976955846.

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

It is a cyclic number.

It is not a de Polignac number, because 648559679 - 2²⁸ = 380124223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648559609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345319 + ... + 1345800.

It is an arithmetic number, because the mean of its divisors is an integer number (162812760).

Almost surely, 2^648559679 is an apocalyptic number.

648559679 is a deficient number, since it is larger than the sum of its proper divisors (2691361).

648559679 is a wasteful number, since it uses less digits than its factorization.

648559679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691360.

The product of its digits is 16329600, while the sum is 59.

The square root of 648559679 is about 25466.8348838249. The cubic root of 648559679 is about 865.5988053067.

The spelling of 648559679 in words is "six hundred forty-eight million, five hundred fifty-nine thousand, six hundred seventy-nine".