648559872 has 90 divisors (see below), whose sum is σ = 1933950018. Its totient is φ = 216179712.

The previous prime is 648559871. The next prime is 648559921. The reversal of 648559872 is 278955846.

648559872 is a `hidden beast` number, since 6 + 4 + 8 + 559 + 87 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 571401216 + 77158656 = 23904^2 + 8784^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648559871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5098 + ... + 36374.

Almost surely, 2^648559872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648559872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (966975009).

648559872 is an abundant number, since it is smaller than the sum of its proper divisors (1285390146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648559872 is an equidigital number, since it uses as much as digits as its factorization.

648559872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31305 (or 31282 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The square root of 648559872 is about 25466.8386730666. The cubic root of 648559872 is about 865.5988911691.

It can be divided in two parts, 648 and 559872, that multiplied together give a 11-th power (362797056 = 6¹¹).

The spelling of 648559872 in words is "six hundred forty-eight million, five hundred fifty-nine thousand, eight hundred seventy-two".