649738818 has 48 divisors (see below), whose sum is σ = 1430507520. Its totient is φ = 213100992.

The previous prime is 649738811. The next prime is 649738847. The reversal of 649738818 is 818837946.

It is not an unprimeable number, because it can be changed into a prime (649738811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544030 + ... + 545222.

It is an arithmetic number, because the mean of its divisors is an integer number (29802240).

Almost surely, 2^649738818 is an apocalyptic number.

649738818 is an abundant number, since it is smaller than the sum of its proper divisors (780768702).

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

649738818 is a wasteful number, since it uses less digits than its factorization.

649738818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663 (or 1660 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 649738818 is about 25489.9748528711. The cubic root of 649738818 is about 866.1230661757.

The spelling of 649738818 in words is "six hundred forty-nine million, seven hundred thirty-eight thousand, eight hundred eighteen".