648728125 has 12 divisors (see below), whose sum is σ = 810862164. Its totient is φ = 518980000.

The previous prime is 648728123. The next prime is 648728189. The reversal of 648728125 is 521827846.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 417262329 + 231465796 = 20427^2 + 15214^2 .

It is not a de Polignac number, because 648728125 - 2¹ = 648728123 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 (648728123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100672 + ... + 106921.

It is an arithmetic number, because the mean of its divisors is an integer number (67571847).

Almost surely, 2^648728125 is an apocalyptic number.

It is an amenable number.

648728125 is a deficient number, since it is larger than the sum of its proper divisors (162134039).

648728125 is an frugal number, since it uses more digits than its factorization.

648728125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207618 (or 207598 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The square root of 648728125 is about 25470.1418331347. The cubic root of 648728125 is about 865.6737375192.

The spelling of 648728125 in words is "six hundred forty-eight million, seven hundred twenty-eight thousand, one hundred twenty-five".