68428778 has 8 divisors (see below), whose sum is σ = 111974400. Its totient is φ = 31103980.

The previous prime is 68428753. The next prime is 68428793. The reversal of 68428778 is 87782486.

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, 1555178 + ... + 1555221.

It is an arithmetic number, because the mean of its divisors is an integer number (13996800).

Almost surely, 2^68428778 is an apocalyptic number.

68428778 is a deficient number, since it is larger than the sum of its proper divisors (43545622).

68428778 is a wasteful number, since it uses less digits than its factorization.

68428778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110412.

The product of its digits is 1204224, while the sum is 50.

The square root of 68428778 is about 8272.1688812548. The cubic root of 68428778 is about 409.0216171723.

The spelling of 68428778 in words is "sixty-eight million, four hundred twenty-eight thousand, seven hundred seventy-eight".