71608140 has 144 divisors (see below), whose sum is σ = 230420736. Its totient is φ = 17971200.

The previous prime is 71608139. The next prime is 71608151. The reversal of 71608140 is 4180617.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228624 + ... + 228936.

It is an arithmetic number, because the mean of its divisors is an integer number (1600144).

Almost surely, 2^71608140 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 71608140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115210368).

71608140 is an abundant number, since it is smaller than the sum of its proper divisors (158812596).

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

71608140 is a wasteful number, since it uses less digits than its factorization.

71608140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 71608140 is about 8462.1592989024. The cubic root of 71608140 is about 415.2606675136.

Adding to 71608140 its reverse (4180617), we get a palindrome (75788757).

The spelling of 71608140 in words is "seventy-one million, six hundred eight thousand, one hundred forty".