71891412 has 24 divisors (see below), whose sum is σ = 168688800. Its totient is φ = 23829216.

The previous prime is 71891411. The next prime is 71891431. The reversal of 71891412 is 21419817.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71891411) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14587 + ... + 18882.

It is an arithmetic number, because the mean of its divisors is an integer number (7028700).

Almost surely, 2^71891412 is an apocalyptic number.

It is an amenable number.

71891412 is an abundant number, since it is smaller than the sum of its proper divisors (96797388).

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

71891412 is a wasteful number, since it uses less digits than its factorization.

71891412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33655 (or 33653 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 71891412 is about 8478.8803506123. The cubic root of 71891412 is about 415.8075185100.

The spelling of 71891412 in words is "seventy-one million, eight hundred ninety-one thousand, four hundred twelve".