71242812 has 36 divisors (see below), whose sum is σ = 183488760. Its totient is φ = 23298912.

The previous prime is 71242807. The next prime is 71242819. The reversal of 71242812 is 21824217.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71242819) 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 11 ways as a sum of consecutive naturals, for example, 16762 + ... + 20577.

It is an arithmetic number, because the mean of its divisors is an integer number (5096910).

Almost surely, 2^71242812 is an apocalyptic number.

It is an amenable number.

71242812 is an abundant number, since it is smaller than the sum of its proper divisors (112245948).

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

71242812 is a wasteful number, since it uses less digits than its factorization.

71242812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37402 (or 37397 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 71242812 is about 8440.5457169546. The cubic root of 71242812 is about 414.5532755282.

The spelling of 71242812 in words is "seventy-one million, two hundred forty-two thousand, eight hundred twelve".