648675945 has 40 divisors (see below), whose sum is σ = 1169368200. Its totient is φ = 344010240.

The previous prime is 648675943. The next prime is 648675947. The reversal of 648675945 is 549576846.

648675945 is a `hidden beast` number, since 6 + 48 + 6 + 7 + 594 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (648675943) and next prime (648675947).

It can be written as a sum of positive squares in 4 ways, for example, as 93083904 + 555592041 = 9648^2 + 23571^2 .

It is not a de Polignac number, because 648675945 - 2¹ = 648675943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648675891 and 648675900.

It is not an unprimeable number, because it can be changed into a prime (648675943) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68881 + ... + 77729.

It is an arithmetic number, because the mean of its divisors is an integer number (29234205).

Almost surely, 2^648675945 is an apocalyptic number.

It is an amenable number.

648675945 is a deficient number, since it is larger than the sum of its proper divisors (520692255).

648675945 is a wasteful number, since it uses less digits than its factorization.

648675945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9047 (or 9038 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 648675945 is about 25469.1174758765. The cubic root of 648675945 is about 865.6505269399.

Subtracting from 648675945 its reverse (549576846), we obtain a palindrome (99099099).

The spelling of 648675945 in words is "six hundred forty-eight million, six hundred seventy-five thousand, nine hundred forty-five".