68775779 has 4 divisors (see below), whose sum is σ = 69078984. Its totient is φ = 68472576.

The previous prime is 68775767. The next prime is 68775787. The reversal of 68775779 is 97757786.

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

It is a cyclic number.

It is not a de Polignac number, because 68775779 - 2¹² = 68771683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68775379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151262 + ... + 151715.

It is an arithmetic number, because the mean of its divisors is an integer number (17269746).

Almost surely, 2^68775779 is an apocalyptic number.

68775779 is a deficient number, since it is larger than the sum of its proper divisors (303205).

68775779 is a wasteful number, since it uses less digits than its factorization.

68775779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303204.

The product of its digits is 5186160, while the sum is 56.

The square root of 68775779 is about 8293.1163623815. The cubic root of 68775779 is about 409.7118320122.

The spelling of 68775779 in words is "sixty-eight million, seven hundred seventy-five thousand, seven hundred seventy-nine".