71033440 has 48 divisors (see below), whose sum is σ = 169147440. Its totient is φ = 28188160.

The previous prime is 71033437. The next prime is 71033449. The reversal of 71033440 is 4433017.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71033449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19266 + ... + 22654.

It is an arithmetic number, because the mean of its divisors is an integer number (3523905).

Almost surely, 2^71033440 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 71033440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84573720).

71033440 is an abundant number, since it is smaller than the sum of its proper divisors (98114000).

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

71033440 is a wasteful number, since it uses less digits than its factorization.

71033440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535 (or 3527 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 71033440 is about 8428.1338385197. The cubic root of 71033440 is about 414.1467736335.

Adding to 71033440 its reverse (4433017), we get a palindrome (75466457).

The spelling of 71033440 in words is "seventy-one million, thirty-three thousand, four hundred forty".