68047778 has 18 divisors (see below), whose sum is σ = 108078651. Its totient is φ = 32128164.

The previous prime is 68047769. The next prime is 68047789. The reversal of 68047778 is 87774086.

It can be written as a sum of positive squares in only one way, i.e., 34023889 + 34023889 = 5833^2 + 5833^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5833.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 221501 + ... + 221807.

Almost surely, 2^68047778 is an apocalyptic number.

68047778 is a deficient number, since it is larger than the sum of its proper divisors (40030873).

68047778 is an equidigital number, since it uses as much as digits as its factorization.

68047778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 68047778 is about 8249.1077093223. The cubic root of 68047778 is about 408.2610825751.

The spelling of 68047778 in words is "sixty-eight million, forty-seven thousand, seven hundred seventy-eight".