71943424 has 72 divisors (see below), whose sum is σ = 172840640. Its totient is φ = 29196288.

The previous prime is 71943413. The next prime is 71943449. The reversal of 71943424 is 42434917.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71943424.

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, 32992 + ... + 35104.

Almost surely, 2^71943424 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 71943424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86420320).

71943424 is an abundant number, since it is smaller than the sum of its proper divisors (100897216).

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

71943424 is a wasteful number, since it uses less digits than its factorization.

71943424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155 (or 2141 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 71943424 is about 8481.9469463090. The cubic root of 71943424 is about 415.9077704807.

The spelling of 71943424 in words is "seventy-one million, nine hundred forty-three thousand, four hundred twenty-four".