68723643 has 4 divisors (see below), whose sum is σ = 91631528. Its totient is φ = 45815760.

The previous prime is 68723623. The next prime is 68723657. The reversal of 68723643 is 34632786.

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

It is not a de Polignac number, because 68723643 - 2⁹ = 68723131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68723623) 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, 11453938 + ... + 11453943.

It is an arithmetic number, because the mean of its divisors is an integer number (22907882).

Almost surely, 2^68723643 is an apocalyptic number.

68723643 is a deficient number, since it is larger than the sum of its proper divisors (22907885).

68723643 is a wasteful number, since it uses less digits than its factorization.

68723643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22907884.

The product of its digits is 145152, while the sum is 39.

The square root of 68723643 is about 8289.9724366249. The cubic root of 68723643 is about 409.6082774556.

The spelling of 68723643 in words is "sixty-eight million, seven hundred twenty-three thousand, six hundred forty-three".