68978978 has 16 divisors (see below), whose sum is σ = 108293760. Its totient is φ = 32890176.

The previous prime is 68978977. The next prime is 68979007. The reversal of 68978978 is 87987986.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68978978.

It is not an unprimeable number, because it can be changed into a prime (68978971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14426 + ... + 18602.

It is an arithmetic number, because the mean of its divisors is an integer number (6768360).

Almost surely, 2^68978978 is an apocalyptic number.

68978978 is a deficient number, since it is larger than the sum of its proper divisors (39314782).

68978978 is a wasteful number, since it uses less digits than its factorization.

68978978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561.

The product of its digits is 12192768, while the sum is 62.

The square root of 68978978 is about 8305.3583908222. The cubic root of 68978978 is about 410.1149350587.

The spelling of 68978978 in words is "sixty-eight million, nine hundred seventy-eight thousand, nine hundred seventy-eight".