68471691 has 4 divisors (see below), whose sum is σ = 91295592. Its totient is φ = 45647792.

The previous prime is 68471657. The next prime is 68471731. The reversal of 68471691 is 19617486.

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 68471691 - 2¹⁰ = 68470667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68471651) 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, 11411946 + ... + 11411951.

It is an arithmetic number, because the mean of its divisors is an integer number (22823898).

Almost surely, 2^68471691 is an apocalyptic number.

68471691 is a deficient number, since it is larger than the sum of its proper divisors (22823901).

68471691 is a wasteful number, since it uses less digits than its factorization.

68471691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22823900.

The product of its digits is 72576, while the sum is 42.

The square root of 68471691 is about 8274.7622926583. The cubic root of 68471691 is about 409.1071010740.

The spelling of 68471691 in words is "sixty-eight million, four hundred seventy-one thousand, six hundred ninety-one".