71681320 has 16 divisors (see below), whose sum is σ = 161283060. Its totient is φ = 28672512.

The previous prime is 71681303. The next prime is 71681329. The reversal of 71681320 is 2318617.

It can be written as a sum of positive squares in 2 ways, for example, as 69923044 + 1758276 = 8362^2 + 1326^2 .

It is not an unprimeable number, because it can be changed into a prime (71681329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895977 + ... + 896056.

Almost surely, 2^71681320 is an apocalyptic number.

It is an amenable number.

71681320 is an abundant number, since it is smaller than the sum of its proper divisors (89601740).

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

71681320 is a wasteful number, since it uses less digits than its factorization.

71681320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792044 (or 1792040 counting only the distinct ones).

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

The square root of 71681320 is about 8466.4821502204. The cubic root of 71681320 is about 415.4020780179.

Adding to 71681320 its reverse (2318617), we get a palindrome (73999937).

The spelling of 71681320 in words is "seventy-one million, six hundred eighty-one thousand, three hundred twenty".