648319625 has 8 divisors (see below), whose sum is σ = 809103048. Its totient is φ = 518655600.

The previous prime is 648319603. The next prime is 648319627. The reversal of 648319625 is 526913846.

It can be written as a sum of positive squares in 4 ways, for example, as 181413961 + 466905664 = 13469^2 + 21608^2 .

It is not a de Polignac number, because 648319625 - 2⁸ = 648319369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648319627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2593154 + ... + 2593403.

It is an arithmetic number, because the mean of its divisors is an integer number (101137881).

Almost surely, 2^648319625 is an apocalyptic number.

It is an amenable number.

648319625 is a deficient number, since it is larger than the sum of its proper divisors (160783423).

648319625 is an equidigital number, since it uses as much as digits as its factorization.

648319625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186572 (or 5186562 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 648319625 is about 25462.1213766646. The cubic root of 648319625 is about 865.4919962731.

The spelling of 648319625 in words is "six hundred forty-eight million, three hundred nineteen thousand, six hundred twenty-five".