71685812 has 24 divisors (see below), whose sum is σ = 138119520. Its totient is φ = 32283360.

The previous prime is 71685799. The next prime is 71685847. The reversal of 71685812 is 21858617.

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 7 ways as a sum of consecutive naturals, for example, 2678 + ... + 12269.

It is an arithmetic number, because the mean of its divisors is an integer number (5754980).

Almost surely, 2^71685812 is an apocalyptic number.

It is an amenable number.

71685812 is a deficient number, since it is larger than the sum of its proper divisors (66433708).

71685812 is a wasteful number, since it uses less digits than its factorization.

71685812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15071 (or 15069 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 71685812 is about 8466.7474274363. The cubic root of 71685812 is about 415.4107550678.

The spelling of 71685812 in words is "seventy-one million, six hundred eighty-five thousand, eight hundred twelve".