648065509 has 64 divisors (see below), whose sum is σ = 882524160. Its totient is φ = 461583360.

The previous prime is 648065507. The next prime is 648065521. The reversal of 648065509 is 905560846.

It is not a de Polignac number, because 648065509 - 2¹ = 648065507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648065507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5735037 + ... + 5735149.

It is an arithmetic number, because the mean of its divisors is an integer number (13789440).

Almost surely, 2^648065509 is an apocalyptic number.

It is an amenable number.

648065509 is a deficient number, since it is larger than the sum of its proper divisors (234458651).

648065509 is a wasteful number, since it uses less digits than its factorization.

648065509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 648065509 is about 25457.1308084788. The cubic root of 648065509 is about 865.3789017966.

The spelling of 648065509 in words is "six hundred forty-eight million, sixty-five thousand, five hundred nine".