68581728 has 60 divisors (see below), whose sum is σ = 201704580. Its totient is φ = 22859712.

The previous prime is 68581691. The next prime is 68581729. The reversal of 68581728 is 82718586.

68581728 is a `hidden beast` number, since 68 + 581 + 7 + 2 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68581729) 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 9 ways as a sum of consecutive naturals, for example, 10638 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (3361743).

Almost surely, 2^68581728 is an apocalyptic number.

It is an amenable number.

68581728 is an abundant number, since it is smaller than the sum of its proper divisors (133122852).

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

68581728 is a wasteful number, since it uses less digits than its factorization.

68581728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26481 (or 26464 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 68581728 is about 8281.4085758402. The cubic root of 68581728 is about 409.3261347808.

The spelling of 68581728 in words is "sixty-eight million, five hundred eighty-one thousand, seven hundred twenty-eight".