71687424 has 72 divisors (see below), whose sum is σ = 192054240. Its totient is φ = 23738368.

The previous prime is 71687417. The next prime is 71687467. The reversal of 71687424 is 42478617.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206419 + ... + 206765.

It is an arithmetic number, because the mean of its divisors is an integer number (2667420).

Almost surely, 2^71687424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71687424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96027120).

71687424 is an abundant number, since it is smaller than the sum of its proper divisors (120366816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71687424 is a wasteful number, since it uses less digits than its factorization.

71687424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 621 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 71687424 is about 8466.8426228435. The cubic root of 71687424 is about 415.4138688272.

The spelling of 71687424 in words is "seventy-one million, six hundred eighty-seven thousand, four hundred twenty-four".