71229812 has 6 divisors (see below), whose sum is σ = 124652178. Its totient is φ = 35614904.

The previous prime is 71229811. The next prime is 71229817. The reversal of 71229812 is 21892217.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 40271716 + 30958096 = 6346^2 + 5564^2 .

It is a super-2 number, since 2×71229812² = 10147372235110688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71229811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8903723 + ... + 8903730.

It is an arithmetic number, because the mean of its divisors is an integer number (20775363).

Almost surely, 2^71229812 is an apocalyptic number.

It is an amenable number.

71229812 is a deficient number, since it is larger than the sum of its proper divisors (53422366).

71229812 is a wasteful number, since it uses less digits than its factorization.

71229812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17807457 (or 17807455 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 71229812 is about 8439.7755894336. The cubic root of 71229812 is about 414.5280588536.

The spelling of 71229812 in words is "seventy-one million, two hundred twenty-nine thousand, eight hundred twelve".