71861812 has 12 divisors (see below), whose sum is σ = 137190816. Its totient is φ = 32664440.

The previous prime is 71861791. The next prime is 71861827. The reversal of 71861812 is 21816817.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816568 + ... + 816655.

It is an arithmetic number, because the mean of its divisors is an integer number (11432568).

Almost surely, 2^71861812 is an apocalyptic number.

It is an amenable number.

71861812 is a deficient number, since it is larger than the sum of its proper divisors (65329004).

71861812 is a wasteful number, since it uses less digits than its factorization.

71861812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633238 (or 1633236 counting only the distinct ones).

The product of its digits is 5376, while the sum is 34.

The square root of 71861812 is about 8477.1346574182. The cubic root of 71861812 is about 415.7504435791.

It can be divided in two parts, 7186 and 1812, that added together give a palindrome (8998).

The spelling of 71861812 in words is "seventy-one million, eight hundred sixty-one thousand, eight hundred twelve".