649235808 has 108 divisors (see below), whose sum is σ = 1999359180. Its totient is φ = 199749888.

The previous prime is 649235803. The next prime is 649235813. The reversal of 649235808 is 808532946.

649235808 is a `hidden beast` number, since 6 + 49 + 23 + 580 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (649235803) and next prime (649235813).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649235803) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 42003 + ... + 55341.

It is an arithmetic number, because the mean of its divisors is an integer number (18512585).

Almost surely, 2^649235808 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 649235808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999679590).

649235808 is an abundant number, since it is smaller than the sum of its proper divisors (1350123372).

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

649235808 is a wasteful number, since it uses less digits than its factorization.

649235808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13381 (or 13357 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 649235808 is about 25480.1061222280. The cubic root of 649235808 is about 865.8994988861.

The spelling of 649235808 in words is "six hundred forty-nine million, two hundred thirty-five thousand, eight hundred eight".