648839913 has 16 divisors (see below), whose sum is σ = 904436736. Its totient is φ = 412972560.

The previous prime is 648839909. The next prime is 648839927. The reversal of 648839913 is 319938846.

It is not a de Polignac number, because 648839913 - 2² = 648839909 is a prime.

It is a super-4 number, since 4×648839913⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (648839953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29148 + ... + 46338.

It is an arithmetic number, because the mean of its divisors is an integer number (56527296).

Almost surely, 2^648839913 is an apocalyptic number.

It is an amenable number.

648839913 is a deficient number, since it is larger than the sum of its proper divisors (255596823).

648839913 is a wasteful number, since it uses less digits than its factorization.

648839913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17764.

The product of its digits is 1119744, while the sum is 51.

The square root of 648839913 is about 25472.3362297218. The cubic root of 648839913 is about 865.7234585934.

The spelling of 648839913 in words is "six hundred forty-eight million, eight hundred thirty-nine thousand, nine hundred thirteen".