71527220 has 12 divisors (see below), whose sum is σ = 150207204. Its totient is φ = 28610880.

The previous prime is 71527213. The next prime is 71527231. The reversal of 71527220 is 2272517.

It can be written as a sum of positive squares in 2 ways, for example, as 16826404 + 54700816 = 4102^2 + 7396^2 .

It is a super-2 number, since 2×71527220² = 10232286401856800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71527220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1788161 + ... + 1788200.

It is an arithmetic number, because the mean of its divisors is an integer number (12517267).

Almost surely, 2^71527220 is an apocalyptic number.

It is an amenable number.

71527220 is an abundant number, since it is smaller than the sum of its proper divisors (78679984).

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

71527220 is a wasteful number, since it uses less digits than its factorization.

71527220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576370 (or 3576368 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 71527220 is about 8457.3766618261. The cubic root of 71527220 is about 415.1041882889.

Adding to 71527220 its reverse (2272517), we get a palindrome (73799737).

The spelling of 71527220 in words is "seventy-one million, five hundred twenty-seven thousand, two hundred twenty".