68722691 has 4 divisors (see below), whose sum is σ = 70939584. Its totient is φ = 66505800.

The previous prime is 68722681. The next prime is 68722697. The reversal of 68722691 is 19622786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19622786 = 2 ⋅9811393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68722691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68722697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108400 + ... + 1108461.

It is an arithmetic number, because the mean of its divisors is an integer number (17734896).

Almost surely, 2^68722691 is an apocalyptic number.

68722691 is a deficient number, since it is larger than the sum of its proper divisors (2216893).

68722691 is a wasteful number, since it uses less digits than its factorization.

68722691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216892.

The product of its digits is 72576, while the sum is 41.

The square root of 68722691 is about 8289.9150176585. The cubic root of 68722691 is about 409.6063860692.

The spelling of 68722691 in words is "sixty-eight million, seven hundred twenty-two thousand, six hundred ninety-one".