71044440 has 64 divisors (see below), whose sum is σ = 218907360. Its totient is φ = 18432000.

The previous prime is 71044409. The next prime is 71044481. The reversal of 71044440 is 4444017.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71044440.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3561 + ... + 12440.

Almost surely, 2^71044440 is an apocalyptic number.

It is an amenable number.

71044440 is an abundant number, since it is smaller than the sum of its proper divisors (147862920).

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

71044440 is a wasteful number, since it uses less digits than its factorization.

71044440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16052 (or 16048 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 71044440 is about 8428.7863895107. The cubic root of 71044440 is about 414.1681503230.

Adding to 71044440 its reverse (4444017), we get a palindrome (75488457).

It can be divided in two parts, 710 and 44440, that added together give a triangular number (45150 = T₃₀₀).

The spelling of 71044440 in words is "seventy-one million, forty-four thousand, four hundred forty".