68888978 has 8 divisors (see below), whose sum is σ = 106896780. Its totient is φ = 33256720.

The previous prime is 68888977. The next prime is 68888999. The reversal of 68888978 is 87988886.

It can be written as a sum of positive squares in 2 ways, for example, as 65885689 + 3003289 = 8117^2 + 1733^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 68888978.

It is not an unprimeable number, because it can be changed into a prime (68888977) 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 in 3 ways as a sum of consecutive naturals, for example, 593813 + ... + 593928.

Almost surely, 2^68888978 is an apocalyptic number.

68888978 is a deficient number, since it is larger than the sum of its proper divisors (38007802).

68888978 is a wasteful number, since it uses less digits than its factorization.

68888978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187772.

The product of its digits is 12386304, while the sum is 62.

The square root of 68888978 is about 8299.9384335066. The cubic root of 68888978 is about 409.9364922454.

The spelling of 68888978 in words is "sixty-eight million, eight hundred eighty-eight thousand, nine hundred seventy-eight".