649306818 has 12 divisors (see below), whose sum is σ = 1406831478. Its totient is φ = 216435600.

The previous prime is 649306799. The next prime is 649306841. The reversal of 649306818 is 818603946.

It can be written as a sum of positive squares in only one way, i.e., 588887289 + 60419529 = 24267^2 + 7773^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18036283 + ... + 18036318.

Almost surely, 2^649306818 is an apocalyptic number.

649306818 is an abundant number, since it is smaller than the sum of its proper divisors (757524660).

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

649306818 is a wasteful number, since it uses less digits than its factorization.

649306818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36072609 (or 36072606 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 649306818 is about 25481.4995241646. The cubic root of 649306818 is about 865.9310669138.

The spelling of 649306818 in words is "six hundred forty-nine million, three hundred six thousand, eight hundred eighteen".