71165980 has 12 divisors (see below), whose sum is σ = 149448600. Its totient is φ = 28466384.

The previous prime is 71165957. The next prime is 71166019. The reversal of 71165980 is 8956117.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1779130 + ... + 1779169.

It is an arithmetic number, because the mean of its divisors is an integer number (12454050).

Almost surely, 2^71165980 is an apocalyptic number.

It is an amenable number.

71165980 is an abundant number, since it is smaller than the sum of its proper divisors (78282620).

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

71165980 is a wasteful number, since it uses less digits than its factorization.

71165980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558308 (or 3558306 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 71165980 is about 8435.9931247008. The cubic root of 71165980 is about 414.4041965631.

The spelling of 71165980 in words is "seventy-one million, one hundred sixty-five thousand, nine hundred eighty".