71011220 has 48 divisors (see below), whose sum is σ = 173335680. Its totient is φ = 23931264.

The previous prime is 71011201. The next prime is 71011247. The reversal of 71011220 is 2211017.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 71011195 and 71011204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3962 + ... + 12558.

It is an arithmetic number, because the mean of its divisors is an integer number (3611160).

Almost surely, 2^71011220 is an apocalyptic number.

71011220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86667840).

71011220 is an abundant number, since it is smaller than the sum of its proper divisors (102324460).

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

71011220 is a wasteful number, since it uses less digits than its factorization.

71011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8672 (or 8670 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 71011220 is about 8426.8155313855. The cubic root of 71011220 is about 414.1035859883.

Adding to 71011220 its reverse (2211017), we get a palindrome (73222237).

The spelling of 71011220 in words is "seventy-one million, eleven thousand, two hundred twenty".