71065520 has 20 divisors (see below), whose sum is σ = 165227520. Its totient is φ = 28426176.

The previous prime is 71065507. The next prime is 71065531. The reversal of 71065520 is 2556017.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 71065520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444080 + ... + 444239.

It is an arithmetic number, because the mean of its divisors is an integer number (8261376).

Almost surely, 2^71065520 is an apocalyptic number.

It is an amenable number.

71065520 is an abundant number, since it is smaller than the sum of its proper divisors (94162000).

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

71065520 is a wasteful number, since it uses less digits than its factorization.

71065520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888332 (or 888326 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 71065520 is about 8430.0367733480. The cubic root of 71065520 is about 414.2091096683.

The spelling of 71065520 in words is "seventy-one million, sixty-five thousand, five hundred twenty".