68780071 has 4 divisors (see below), whose sum is σ = 69034144. Its totient is φ = 68526000.

The previous prime is 68780059. The next prime is 68780093. The reversal of 68780071 is 17008786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17008786 = 2 ⋅8504393.

It is a cyclic number.

It is not a de Polignac number, because 68780071 - 2¹¹ = 68778023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68780071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68780671) 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, 126630 + ... + 127171.

It is an arithmetic number, because the mean of its divisors is an integer number (17258536).

Almost surely, 2^68780071 is an apocalyptic number.

68780071 is a deficient number, since it is larger than the sum of its proper divisors (254073).

68780071 is a wasteful number, since it uses less digits than its factorization.

68780071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254072.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 68780071 is about 8293.3751271723. The cubic root of 68780071 is about 409.7203546182.

The spelling of 68780071 in words is "sixty-eight million, seven hundred eighty thousand, seventy-one".