649668888 has 96 divisors (see below), whose sum is σ = 1942799040. Its totient is φ = 194477760.

The previous prime is 649668853. The next prime is 649668907. The reversal of 649668888 is 888866946.

649668888 is a `hidden beast` number, since 6 + 496 + 68 + 8 + 88 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60795 + ... + 70677.

It is an arithmetic number, because the mean of its divisors is an integer number (20237490).

Almost surely, 2^649668888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649668888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971399520).

649668888 is an abundant number, since it is smaller than the sum of its proper divisors (1293130152).

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

649668888 is a wasteful number, since it uses less digits than its factorization.

649668888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9989 (or 9982 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The square root of 649668888 is about 25488.6031002093. The cubic root of 649668888 is about 866.0919920696.

The spelling of 649668888 in words is "six hundred forty-nine million, six hundred sixty-eight thousand, eight hundred eighty-eight".