68778278 has 4 divisors (see below), whose sum is σ = 103167420. Its totient is φ = 34389138.

The previous prime is 68778253. The next prime is 68778287. The reversal of 68778278 is 87287786.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17194568 + ... + 17194571.

It is an arithmetic number, because the mean of its divisors is an integer number (25791855).

Almost surely, 2^68778278 is an apocalyptic number.

68778278 is a deficient number, since it is larger than the sum of its proper divisors (34389142).

68778278 is a wasteful number, since it uses less digits than its factorization.

68778278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34389141.

The product of its digits is 2107392, while the sum is 53.

The square root of 68778278 is about 8293.2670281379. The cubic root of 68778278 is about 409.7167943089.

The spelling of 68778278 in words is "sixty-eight million, seven hundred seventy-eight thousand, two hundred seventy-eight".