71580240 has 160 divisors (see below), whose sum is σ = 254745600. Its totient is φ = 18455040.

The previous prime is 71580233. The next prime is 71580253. The reversal of 71580240 is 4208517.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66426 + ... + 67494.

It is an arithmetic number, because the mean of its divisors is an integer number (1592160).

Almost surely, 2^71580240 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 71580240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127372800).

71580240 is an abundant number, since it is smaller than the sum of its proper divisors (183165360).

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

71580240 is a wasteful number, since it uses less digits than its factorization.

71580240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1110 counting only the distinct ones).

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

The square root of 71580240 is about 8460.5106228880. The cubic root of 71580240 is about 415.2067291502.

Adding to 71580240 its reverse (4208517), we get a palindrome (75788757).

The spelling of 71580240 in words is "seventy-one million, five hundred eighty thousand, two hundred forty".