71863643 has 4 divisors (see below), whose sum is σ = 75645960. Its totient is φ = 68081328.

The previous prime is 71863639. The next prime is 71863651. The reversal of 71863643 is 34636817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34636817 = 29 ⋅1194373.

It is a cyclic number.

It is not a de Polignac number, because 71863643 - 2² = 71863639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71863597 and 71863606.

It is not an unprimeable number, because it can be changed into a prime (71863243) 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, 1891130 + ... + 1891167.

It is an arithmetic number, because the mean of its divisors is an integer number (18911490).

Almost surely, 2^71863643 is an apocalyptic number.

71863643 is a deficient number, since it is larger than the sum of its proper divisors (3782317).

71863643 is a wasteful number, since it uses less digits than its factorization.

71863643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3782316.

The product of its digits is 72576, while the sum is 38.

The square root of 71863643 is about 8477.2426531273. The cubic root of 71863643 is about 415.7539745811.

The spelling of 71863643 in words is "seventy-one million, eight hundred sixty-three thousand, six hundred forty-three".