68728642 has 8 divisors (see below), whose sum is σ = 104039100. Its totient is φ = 34048944.

The previous prime is 68728631. The next prime is 68728679. The reversal of 68728642 is 24682786.

It can be written as a sum of positive squares in 2 ways, for example, as 63059481 + 5669161 = 7941^2 + 2381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 157417 + ... + 157852.

Almost surely, 2^68728642 is an apocalyptic number.

68728642 is a deficient number, since it is larger than the sum of its proper divisors (35310458).

68728642 is a wasteful number, since it uses less digits than its factorization.

68728642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315380.

The product of its digits is 258048, while the sum is 43.

The square root of 68728642 is about 8290.2739399853. The cubic root of 68728642 is about 409.6182089340.

The spelling of 68728642 in words is "sixty-eight million, seven hundred twenty-eight thousand, six hundred forty-two".