648889529 has 6 divisors (see below), whose sum is σ = 672037470. Its totient is φ = 626513216.

The previous prime is 648889523. The next prime is 648889537. The reversal of 648889529 is 925988846.

648889529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 107163904 + 541725625 = 10352^2 + 23275^2 .

It is not a de Polignac number, because 648889529 - 2¹⁶ = 648823993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648889523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384944 + ... + 386625.

It is an arithmetic number, because the mean of its divisors is an integer number (112006245).

Almost surely, 2^648889529 is an apocalyptic number.

It is an amenable number.

648889529 is a deficient number, since it is larger than the sum of its proper divisors (23147941).

648889529 is an equidigital number, since it uses as much as digits as its factorization.

648889529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771627 (or 771598 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 59.

The square root of 648889529 is about 25473.3101304090. The cubic root of 648889529 is about 865.7455249714.

The spelling of 648889529 in words is "six hundred forty-eight million, eight hundred eighty-nine thousand, five hundred twenty-nine".