71865520 has 20 divisors (see below), whose sum is σ = 167087520. Its totient is φ = 28746176.

The previous prime is 71865517. The next prime is 71865523. The reversal of 71865520 is 2556817.

It is an interprime number because it is at equal distance from previous prime (71865517) and next prime (71865523).

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

It is not an unprimeable number, because it can be changed into a prime (71865523) 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, 449080 + ... + 449239.

It is an arithmetic number, because the mean of its divisors is an integer number (8354376).

Almost surely, 2^71865520 is an apocalyptic number.

It is an amenable number.

71865520 is an abundant number, since it is smaller than the sum of its proper divisors (95222000).

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

71865520 is a wasteful number, since it uses less digits than its factorization.

71865520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898332 (or 898326 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 71865520 is about 8477.3533605719. The cubic root of 71865520 is about 415.7575942297.

The spelling of 71865520 in words is "seventy-one million, eight hundred sixty-five thousand, five hundred twenty".