71002040 has 32 divisors (see below), whose sum is σ = 161784000. Its totient is φ = 28040064.

The previous prime is 71002027. The next prime is 71002049. The reversal of 71002040 is 4020017.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71002049) 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, 8075 + ... + 14394.

It is an arithmetic number, because the mean of its divisors is an integer number (5055750).

Almost surely, 2^71002040 is an apocalyptic number.

It is an amenable number.

71002040 is an abundant number, since it is smaller than the sum of its proper divisors (90781960).

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

71002040 is a wasteful number, since it uses less digits than its factorization.

71002040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22559 (or 22555 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 71002040 is about 8426.2708240360. The cubic root of 71002040 is about 414.0857407579.

Adding to 71002040 its reverse (4020017), we get a palindrome (75022057).

The spelling of 71002040 in words is "seventy-one million, two thousand, forty".