71312660 has 24 divisors (see below), whose sum is σ = 152214216. Its totient is φ = 28056960.

The previous prime is 71312629. The next prime is 71312669. The reversal of 71312660 is 6621317.

It can be written as a sum of positive squares in 4 ways, for example, as 6220036 + 65092624 = 2494^2 + 8068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71312669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28007 + ... + 30446.

It is an arithmetic number, because the mean of its divisors is an integer number (6342259).

Almost surely, 2^71312660 is an apocalyptic number.

It is an amenable number.

71312660 is an abundant number, since it is smaller than the sum of its proper divisors (80901556).

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

71312660 is a wasteful number, since it uses less digits than its factorization.

71312660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58523 (or 58521 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 71312660 is about 8444.6823504499. The cubic root of 71312660 is about 414.6887102880.

Adding to 71312660 its reverse (6621317), we get a palindrome (77933977).

The spelling of 71312660 in words is "seventy-one million, three hundred twelve thousand, six hundred sixty".