648505847 has 8 divisors (see below), whose sum is σ = 707776272. Its totient is φ = 589288000.

The previous prime is 648505843. The next prime is 648505877. The reversal of 648505847 is 748505846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648505847 - 2² = 648505843 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 (648505843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15347 + ... + 39147.

It is an arithmetic number, because the mean of its divisors is an integer number (88472034).

Almost surely, 2^648505847 is an apocalyptic number.

648505847 is a deficient number, since it is larger than the sum of its proper divisors (59270425).

648505847 is a wasteful number, since it uses less digits than its factorization.

648505847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26289.

The product of its (nonzero) digits is 1075200, while the sum is 47.

The square root of 648505847 is about 25465.7779578791. Note that the first 3 decimals coincide. The cubic root of 648505847 is about 865.5748557224.

Subtracting 648505847 from its reverse (748505846), we obtain a palindrome (99999999).

The spelling of 648505847 in words is "six hundred forty-eight million, five hundred five thousand, eight hundred forty-seven".