71745972 has 12 divisors (see below), whose sum is σ = 167407296. Its totient is φ = 23915320.

The previous prime is 71745959. The next prime is 71745977. The reversal of 71745972 is 27954717.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71745977) 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 3 ways as a sum of consecutive naturals, for example, 2989404 + ... + 2989427.

It is an arithmetic number, because the mean of its divisors is an integer number (13950608).

Almost surely, 2^71745972 is an apocalyptic number.

It is an amenable number.

71745972 is an abundant number, since it is smaller than the sum of its proper divisors (95661324).

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

71745972 is a wasteful number, since it uses less digits than its factorization.

71745972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978838 (or 5978836 counting only the distinct ones).

The product of its digits is 123480, while the sum is 42.

The square root of 71745972 is about 8470.2994043894. The cubic root of 71745972 is about 415.5269292571.

The spelling of 71745972 in words is "seventy-one million, seven hundred forty-five thousand, nine hundred seventy-two".