71231680 has 56 divisors (see below), whose sum is σ = 182678832. Its totient is φ = 26299392.

The previous prime is 71231669. The next prime is 71231681. The reversal of 71231680 is 8613217.

It is not an unprimeable number, because it can be changed into a prime (71231681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4402 + ... + 12721.

It is an arithmetic number, because the mean of its divisors is an integer number (3262122).

Almost surely, 2^71231680 is an apocalyptic number.

It is an amenable number.

71231680 is an abundant number, since it is smaller than the sum of its proper divisors (111447152).

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

71231680 is a wasteful number, since it uses less digits than its factorization.

71231680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17153 (or 17143 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 71231680 is about 8439.8862551577. The cubic root of 71231680 is about 414.5316824845.

Adding to 71231680 its reverse (8613217), we get a palindrome (79844897).

The spelling of 71231680 in words is "seventy-one million, two hundred thirty-one thousand, six hundred eighty".