68205728 has 12 divisors (see below), whose sum is σ = 134280090. Its totient is φ = 34102848.

The previous prime is 68205713. The next prime is 68205733. The reversal of 68205728 is 82750286.

It can be written as a sum of positive squares in only one way, i.e., 68095504 + 110224 = 8252^2 + 332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68205691 and 68205700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065683 + ... + 1065746.

Almost surely, 2^68205728 is an apocalyptic number.

It is an amenable number.

68205728 is a deficient number, since it is larger than the sum of its proper divisors (66074362).

68205728 is a wasteful number, since it uses less digits than its factorization.

68205728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131439 (or 2131431 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 68205728 is about 8258.6759229310. The cubic root of 68205728 is about 408.5767186906.

The spelling of 68205728 in words is "sixty-eight million, two hundred five thousand, seven hundred twenty-eight".