71438643 has 12 divisors (see below), whose sum is σ = 104003328. Its totient is φ = 47250000.

The previous prime is 71438617. The next prime is 71438669. The reversal of 71438643 is 34683417.

71438643 is a `hidden beast` number, since 7 + 1 + 4 + 3 + 8 + 643 = 666.

It is an interprime number because it is at equal distance from previous prime (71438617) and next prime (71438669).

It is not a de Polignac number, because 71438643 - 2⁶ = 71438579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71438598 and 71438607.

It is not an unprimeable number, because it can be changed into a prime (71418643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30108 + ... + 32393.

It is an arithmetic number, because the mean of its divisors is an integer number (8666944).

Almost surely, 2^71438643 is an apocalyptic number.

71438643 is a deficient number, since it is larger than the sum of its proper divisors (32564685).

71438643 is a wasteful number, since it uses less digits than its factorization.

71438643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62634 (or 62631 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 71438643 is about 8452.1383684840. The cubic root of 71438643 is about 414.9327669668.

The spelling of 71438643 in words is "seventy-one million, four hundred thirty-eight thousand, six hundred forty-three".