649578516 has 24 divisors (see below), whose sum is σ = 1516129440. Its totient is φ = 216462432.

The previous prime is 649578499. The next prime is 649578521. The reversal of 649578516 is 615875946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53395 + ... + 64421.

It is an arithmetic number, because the mean of its divisors is an integer number (63172060).

Almost surely, 2^649578516 is an apocalyptic number.

It is an amenable number.

649578516 is an abundant number, since it is smaller than the sum of its proper divisors (866550924).

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

649578516 is a wasteful number, since it uses less digits than its factorization.

649578516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15943 (or 15941 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The square root of 649578516 is about 25486.8302462272. The cubic root of 649578516 is about 866.0518310498.

The spelling of 649578516 in words is "six hundred forty-nine million, five hundred seventy-eight thousand, five hundred sixteen".