68628778 has 4 divisors (see below), whose sum is σ = 102943170. Its totient is φ = 34314388.

The previous prime is 68628773. The next prime is 68628787. The reversal of 68628778 is 87782686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65399569 + 3229209 = 8087^2 + 1797^2 .

It is not an unprimeable number, because it can be changed into a prime (68628773) 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 as a sum of consecutive naturals, namely, 17157193 + ... + 17157196.

Almost surely, 2^68628778 is an apocalyptic number.

68628778 is a deficient number, since it is larger than the sum of its proper divisors (34314392).

68628778 is a wasteful number, since it uses less digits than its factorization.

68628778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34314391.

The product of its digits is 1806336, while the sum is 52.

The square root of 68628778 is about 8284.2487891178. The cubic root of 68628778 is about 409.4197184644.

The spelling of 68628778 in words is "sixty-eight million, six hundred twenty-eight thousand, seven hundred seventy-eight".