648687516 has 12 divisors (see below), whose sum is σ = 1513604232. Its totient is φ = 216229168.

The previous prime is 648687509. The next prime is 648687517. The reversal of 648687516 is 615786846.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648687517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27028635 + ... + 27028658.

It is an arithmetic number, because the mean of its divisors is an integer number (126133686).

Almost surely, 2^648687516 is an apocalyptic number.

It is an amenable number.

648687516 is an abundant number, since it is smaller than the sum of its proper divisors (864916716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648687516 is a wasteful number, since it uses less digits than its factorization.

648687516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54057300 (or 54057298 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 648687516 is about 25469.3446323222. The cubic root of 648687516 is about 865.6556740311.

The spelling of 648687516 in words is "six hundred forty-eight million, six hundred eighty-seven thousand, five hundred sixteen".