68011687 has 4 divisors (see below), whose sum is σ = 68078560. Its totient is φ = 67944816.

The previous prime is 68011651. The next prime is 68011693. The reversal of 68011687 is 78611086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78611086 = 2 ⋅39305543.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68011687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68011627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31887 + ... + 33952.

It is an arithmetic number, because the mean of its divisors is an integer number (17019640).

Almost surely, 2^68011687 is an apocalyptic number.

68011687 is a deficient number, since it is larger than the sum of its proper divisors (66873).

68011687 is a wasteful number, since it uses less digits than its factorization.

68011687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66872.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 68011687 is about 8246.9198492528. The cubic root of 68011687 is about 408.1888923342.

The spelling of 68011687 in words is "sixty-eight million, eleven thousand, six hundred eighty-seven".