68905644 has 12 divisors (see below), whose sum is σ = 160779864. Its totient is φ = 22968544.

The previous prime is 68905633. The next prime is 68905667. The reversal of 68905644 is 44650986.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 68905596 and 68905605.

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 3 ways as a sum of consecutive naturals, for example, 2871057 + ... + 2871080.

It is an arithmetic number, because the mean of its divisors is an integer number (13398322).

Almost surely, 2^68905644 is an apocalyptic number.

It is an amenable number.

68905644 is an abundant number, since it is smaller than the sum of its proper divisors (91874220).

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

68905644 is a wasteful number, since it uses less digits than its factorization.

68905644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742144 (or 5742142 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 68905644 is about 8300.9423561425. The cubic root of 68905644 is about 409.9695476093.

The spelling of 68905644 in words is "sixty-eight million, nine hundred five thousand, six hundred forty-four".