71110640 has 40 divisors (see below), whose sum is σ = 165822720. Its totient is φ = 28359936.

The previous prime is 71110631. The next prime is 71110679. The reversal of 71110640 is 4601117.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30641 + ... + 32879.

It is an arithmetic number, because the mean of its divisors is an integer number (4145568).

Almost surely, 2^71110640 is an apocalyptic number.

It is an amenable number.

71110640 is an abundant number, since it is smaller than the sum of its proper divisors (94712080).

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

71110640 is a wasteful number, since it uses less digits than its factorization.

71110640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649 (or 2643 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 71110640 is about 8432.7124936167. The cubic root of 71110640 is about 414.2967525511.

Adding to 71110640 its reverse (4601117), we get a palindrome (75711757).

The spelling of 71110640 in words is "seventy-one million, one hundred ten thousand, six hundred forty".