648864669 has 16 divisors (see below), whose sum is σ = 879966720. Its totient is φ = 425206320.

The previous prime is 648864659. The next prime is 648864709. The reversal of 648864669 is 966468846.

It is not a de Polignac number, because 648864669 - 2¹³ = 648856477 is a prime.

It is a super-2 number, since 2×648864669² = 842050717352959122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648864659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69522 + ... + 78300.

It is an arithmetic number, because the mean of its divisors is an integer number (54997920).

Almost surely, 2^648864669 is an apocalyptic number.

It is an amenable number.

648864669 is a deficient number, since it is larger than the sum of its proper divisors (231102051).

648864669 is a wasteful number, since it uses less digits than its factorization.

648864669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9200.

The product of its digits is 11943936, while the sum is 57.

The square root of 648864669 is about 25472.8221640242. The cubic root of 648864669 is about 865.7344687964.

The spelling of 648864669 in words is "six hundred forty-eight million, eight hundred sixty-four thousand, six hundred sixty-nine".