68091656 has 8 divisors (see below), whose sum is σ = 127671870. Its totient is φ = 34045824.

The previous prime is 68091643. The next prime is 68091689. The reversal of 68091656 is 65619086.

It can be written as a sum of positive squares in only one way, i.e., 52330756 + 15760900 = 7234^2 + 3970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 4255721 + ... + 4255736.

Almost surely, 2^68091656 is an apocalyptic number.

It is an amenable number.

68091656 is a deficient number, since it is larger than the sum of its proper divisors (59580214).

68091656 is a wasteful number, since it uses less digits than its factorization.

68091656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8511463 (or 8511459 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 68091656 is about 8251.7668411074. The cubic root of 68091656 is about 408.3488142217.

The spelling of 68091656 in words is "sixty-eight million, ninety-one thousand, six hundred fifty-six".