648864671 has 32 divisors (see below), whose sum is σ = 828592128. Its totient is φ = 494398080.

The previous prime is 648864659. The next prime is 648864709. The reversal of 648864671 is 176468846.

It is a cyclic number.

It is not a de Polignac number, because 648864671 - 2¹⁴ = 648848287 is a prime.

It is a super-2 number, since 2×648864671² = 842050722543876482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648864631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345866 + ... + 347736.

It is an arithmetic number, because the mean of its divisors is an integer number (25893504).

Almost surely, 2^648864671 is an apocalyptic number.

648864671 is a deficient number, since it is larger than the sum of its proper divisors (179727457).

648864671 is a wasteful number, since it uses less digits than its factorization.

648864671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031.

The product of its digits is 1548288, while the sum is 50.

The square root of 648864671 is about 25472.8222032817. The cubic root of 648864671 is about 865.7344696859.

The spelling of 648864671 in words is "six hundred forty-eight million, eight hundred sixty-four thousand, six hundred seventy-one".