71081280 has 224 divisors, whose sum is σ = 264566400. Its totient is φ = 17915904.

The previous prime is 71081243. The next prime is 71081281. The reversal of 71081280 is 8218017.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71081281) 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 31 ways as a sum of consecutive naturals, for example, 163944 + ... + 164376.

It is an arithmetic number, because the mean of its divisors is an integer number (1181100).

Almost surely, 2^71081280 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 71081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132283200).

71081280 is an abundant number, since it is smaller than the sum of its proper divisors (193485120).

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

71081280 is a wasteful number, since it uses less digits than its factorization.

71081280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 71081280 is about 8430.9714742727. The cubic root of 71081280 is about 414.2397267339.

Adding to 71081280 its reverse (8218017), we get a palindrome (79299297).

The spelling of 71081280 in words is "seventy-one million, eighty-one thousand, two hundred eighty".