648805684 has 6 divisors (see below), whose sum is σ = 1135409954. Its totient is φ = 324402840.

The previous prime is 648805669. The next prime is 648805687. The reversal of 648805684 is 486508846.

It can be written as a sum of positive squares in only one way, i.e., 616429584 + 32376100 = 24828^2 + 5690^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648805687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81100707 + ... + 81100714.

Almost surely, 2^648805684 is an apocalyptic number.

It is an amenable number.

648805684 is a deficient number, since it is larger than the sum of its proper divisors (486604270).

648805684 is a wasteful number, since it uses less digits than its factorization.

648805684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162201425 (or 162201423 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The square root of 648805684 is about 25471.6643350999. The cubic root of 648805684 is about 865.7082348232.

The spelling of 648805684 in words is "six hundred forty-eight million, eight hundred five thousand, six hundred eighty-four".