71045280 has 144 divisors (see below), whose sum is σ = 245306880. Its totient is φ = 18722304.

The previous prime is 71045269. The next prime is 71045287. The reversal of 71045280 is 8254017.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71045287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148081 + ... + 148559.

It is an arithmetic number, because the mean of its divisors is an integer number (1703520).

Almost surely, 2^71045280 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 71045280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122653440).

71045280 is an abundant number, since it is smaller than the sum of its proper divisors (174261600).

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

71045280 is a wasteful number, since it uses less digits than its factorization.

71045280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 71045280 is about 8428.8362186010. The cubic root of 71045280 is about 414.1697826340.

Adding to 71045280 its reverse (8254017), we get a palindrome (79299297).

The spelling of 71045280 in words is "seventy-one million, forty-five thousand, two hundred eighty".