649408806 has 64 divisors (see below), whose sum is σ = 1553204160. Its totient is φ = 200378880.

The previous prime is 649408769. The next prime is 649408831. The reversal of 649408806 is 608804946.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50200 + ... + 61796.

It is an arithmetic number, because the mean of its divisors is an integer number (24268815).

Almost surely, 2^649408806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649408806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776602080).

649408806 is an abundant number, since it is smaller than the sum of its proper divisors (903795354).

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

649408806 is a wasteful number, since it uses less digits than its factorization.

649408806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11686 (or 11680 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 649408806 is about 25483.5006621932. The cubic root of 649408806 is about 865.9764024171.

The spelling of 649408806 in words is "six hundred forty-nine million, four hundred eight thousand, eight hundred six".