71684638 has 8 divisors (see below), whose sum is σ = 109289880. Its totient is φ = 35254680.

The previous prime is 71684633. The next prime is 71684647. The reversal of 71684638 is 83648617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 71684594 and 71684603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71684633) 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, 293668 + ... + 293911.

It is an arithmetic number, because the mean of its divisors is an integer number (13661235).

Almost surely, 2^71684638 is an apocalyptic number.

71684638 is a deficient number, since it is larger than the sum of its proper divisors (37605242).

71684638 is a wasteful number, since it uses less digits than its factorization.

71684638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587642.

The product of its digits is 193536, while the sum is 43.

The square root of 71684638 is about 8466.6780971051. The cubic root of 71684638 is about 415.4084873253.

The spelling of 71684638 in words is "seventy-one million, six hundred eighty-four thousand, six hundred thirty-eight".