71787812 has 12 divisors (see below), whose sum is σ = 128550576. Its totient is φ = 35059080.

The previous prime is 71787809. The next prime is 71787827. The reversal of 71787812 is 21878717.

It is a self number, because there is not a number n which added to its sum of digits gives 71787812.

It is an unprimeable number.

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, 208514 + ... + 208857.

It is an arithmetic number, because the mean of its divisors is an integer number (10712548).

Almost surely, 2^71787812 is an apocalyptic number.

It is an amenable number.

71787812 is a deficient number, since it is larger than the sum of its proper divisors (56762764).

71787812 is a wasteful number, since it uses less digits than its factorization.

71787812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417418 (or 417416 counting only the distinct ones).

The product of its digits is 43904, while the sum is 41.

The square root of 71787812 is about 8472.7688508539. The cubic root of 71787812 is about 415.6076876502.

The spelling of 71787812 in words is "seventy-one million, seven hundred eighty-seven thousand, eight hundred twelve".