71145660 has 48 divisors (see below), whose sum is σ = 204073632. Its totient is φ = 18508800.

The previous prime is 71145643. The next prime is 71145661. The reversal of 71145660 is 6654117.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71145661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12001 + ... + 16920.

It is an arithmetic number, because the mean of its divisors is an integer number (4251534).

Almost surely, 2^71145660 is an apocalyptic number.

It is an amenable number.

71145660 is an abundant number, since it is smaller than the sum of its proper divisors (132927972).

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

71145660 is a wasteful number, since it uses less digits than its factorization.

71145660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28974 (or 28972 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 71145660 is about 8434.7886754797. The cubic root of 71145660 is about 414.3647512417.

Adding to 71145660 its reverse (6654117), we get a palindrome (77799777).

The spelling of 71145660 in words is "seventy-one million, one hundred forty-five thousand, six hundred sixty".