71221072 has 40 divisors (see below), whose sum is σ = 152080544. Its totient is φ = 32102784.

The previous prime is 71221049. The next prime is 71221081. The reversal of 71221072 is 27012217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4963 + ... + 12925.

Almost surely, 2^71221072 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 71221072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76040272).

71221072 is an abundant number, since it is smaller than the sum of its proper divisors (80859472).

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

71221072 is a wasteful number, since it uses less digits than its factorization.

71221072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8027 (or 8021 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 71221072 is about 8439.2577872702. The cubic root of 71221072 is about 414.5111037645.

Adding to 71221072 its reverse (27012217), we get a palindrome (98233289).

The spelling of 71221072 in words is "seventy-one million, two hundred twenty-one thousand, seventy-two".