71520066 has 24 divisors (see below), whose sum is σ = 163116720. Its totient is φ = 22585176.

The previous prime is 71520017. The next prime is 71520067. The reversal of 71520066 is 66002517.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71520067) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 104220 + ... + 104903.

It is an arithmetic number, because the mean of its divisors is an integer number (6796530).

Almost surely, 2^71520066 is an apocalyptic number.

71520066 is an abundant number, since it is smaller than the sum of its proper divisors (91596654).

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

71520066 is a wasteful number, since it uses less digits than its factorization.

71520066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209150 (or 209147 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 71520066 is about 8456.9537068616. The cubic root of 71520066 is about 415.0903485489.

The spelling of 71520066 in words is "seventy-one million, five hundred twenty thousand, sixty-six".