71968643 has 4 divisors (see below), whose sum is σ = 72427200. Its totient is φ = 71510088.

The previous prime is 71968591. The next prime is 71968651. The reversal of 71968643 is 34686917.

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 71968643 - 2⁶ = 71968579 is a prime.

It is a super-2 number, since 2×71968643² = 10358971150522898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71968594 and 71968603.

It is not an unprimeable number, because it can be changed into a prime (71968843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229043 + ... + 229356.

It is an arithmetic number, because the mean of its divisors is an integer number (18106800).

Almost surely, 2^71968643 is an apocalyptic number.

71968643 is a deficient number, since it is larger than the sum of its proper divisors (458557).

71968643 is a wasteful number, since it uses less digits than its factorization.

71968643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458556.

The product of its digits is 217728, while the sum is 44.

The square root of 71968643 is about 8483.4334440720. The cubic root of 71968643 is about 415.9563621478.

The spelling of 71968643 in words is "seventy-one million, nine hundred sixty-eight thousand, six hundred forty-three".