71029640 has 64 divisors (see below), whose sum is σ = 179098560. Its totient is φ = 25125120.

The previous prime is 71029633. The next prime is 71029661. The reversal of 71029640 is 4692017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14099 + ... + 18461.

It is an arithmetic number, because the mean of its divisors is an integer number (2798415).

Almost surely, 2^71029640 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 71029640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89549280).

71029640 is an abundant number, since it is smaller than the sum of its proper divisors (108068920).

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

71029640 is a wasteful number, since it uses less digits than its factorization.

71029640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4418 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 71029640 is about 8427.9084000718. The cubic root of 71029640 is about 414.1393884461.

The spelling of 71029640 in words is "seventy-one million, twenty-nine thousand, six hundred forty".