71044040 has 32 divisors (see below), whose sum is σ = 168264000. Its totient is φ = 26921664.

The previous prime is 71044031. The next prime is 71044049. The reversal of 71044040 is 4044017.

It is an interprime number because it is at equal distance from previous prime (71044031) and next prime (71044049).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (71044049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45980 + ... + 47499.

It is an arithmetic number, because the mean of its divisors is an integer number (5258250).

Almost surely, 2^71044040 is an apocalyptic number.

It is an amenable number.

71044040 is an abundant number, since it is smaller than the sum of its proper divisors (97219960).

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

71044040 is a wasteful number, since it uses less digits than its factorization.

71044040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93509 (or 93505 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 71044040 is about 8428.7626612689. The cubic root of 71044040 is about 414.1673730275.

Adding to 71044040 its reverse (4044017), we get a palindrome (75088057).

The spelling of 71044040 in words is "seventy-one million, forty-four thousand, forty".