71215560 has 96 divisors (see below), whose sum is σ = 249270840. Its totient is φ = 17528832.

The previous prime is 71215549. The next prime is 71215583. The reversal of 71215560 is 6551217.

It can be written as a sum of positive squares in 4 ways, for example, as 57062916 + 14152644 = 7554^2 + 3762^2 .

It is a super-2 number, since 2×71215560² = 10143311972227200, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 2929 + ... + 12288.

Almost surely, 2^71215560 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 71215560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124635420).

71215560 is an abundant number, since it is smaller than the sum of its proper divisors (178055280).

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

71215560 is a wasteful number, since it uses less digits than its factorization.

71215560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15247 (or 15240 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 71215560 is about 8438.9312119486. The cubic root of 71215560 is about 414.5004100935.

Adding to 71215560 its reverse (6551217), we get a palindrome (77766777).

The spelling of 71215560 in words is "seventy-one million, two hundred fifteen thousand, five hundred sixty".