805649688 has 24 divisors (see below), whose sum is σ = 2181968100. Its totient is φ = 268549872.

The previous prime is 805649687. The next prime is 805649749. The reversal of 805649688 is 886946508.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805649683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5594718 + ... + 5594861.

Almost surely, 2^805649688 is an apocalyptic number.

It is an amenable number.

805649688 is an abundant number, since it is smaller than the sum of its proper divisors (1376318412).

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

805649688 is a wasteful number, since it uses less digits than its factorization.

805649688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11189591 (or 11189584 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The square root of 805649688 is about 28383.9688556763. The cubic root of 805649688 is about 930.4979366098.

The spelling of 805649688 in words is "eight hundred five million, six hundred forty-nine thousand, six hundred eighty-eight".