68780656 has 20 divisors (see below), whose sum is σ = 152300272. Its totient is φ = 29477376.

The previous prime is 68780609. The next prime is 68780671. The reversal of 68780656 is 65608786.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306945 + ... + 307168.

Almost surely, 2^68780656 is an apocalyptic number.

It is an amenable number.

68780656 is an abundant number, since it is smaller than the sum of its proper divisors (83519616).

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

68780656 is a wasteful number, since it uses less digits than its factorization.

68780656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614128 (or 614122 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 68780656 is about 8293.4103962122. The cubic root of 68780656 is about 409.7215162228.

The spelling of 68780656 in words is "sixty-eight million, seven hundred eighty thousand, six hundred fifty-six".