68497978 has 8 divisors (see below), whose sum is σ = 102926772. Its totient is φ = 34189056.

The previous prime is 68497973. The next prime is 68497999. The reversal of 68497978 is 87979486.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 59954049 + 8543929 = 7743^2 + 2923^2 .

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

It is not an unprimeable number, because it can be changed into a prime (68497973) 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, 28525 + ... + 30832.

Almost surely, 2^68497978 is an apocalyptic number.

68497978 is a deficient number, since it is larger than the sum of its proper divisors (34428794).

68497978 is a wasteful number, since it uses less digits than its factorization.

68497978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59936.

The product of its digits is 6096384, while the sum is 58.

The square root of 68497978 is about 8276.3505242347. The cubic root of 68497978 is about 409.1594478774.

The spelling of 68497978 in words is "sixty-eight million, four hundred ninety-seven thousand, nine hundred seventy-eight".