71447272 has 16 divisors (see below), whose sum is σ = 144268740. Its totient is φ = 32975616.

The previous prime is 71447267. The next prime is 71447273. The reversal of 71447272 is 27274417.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70459236 + 988036 = 8394^2 + 994^2 .

71447272 is a modest number, since divided by 7272 gives 7144 as remainder.

It is not an unprimeable number, because it can be changed into a prime (71447273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343393 + ... + 343600.

Almost surely, 2^71447272 is an apocalyptic number.

It is an amenable number.

71447272 is an abundant number, since it is smaller than the sum of its proper divisors (72821468).

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

71447272 is a wasteful number, since it uses less digits than its factorization.

71447272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687012 (or 687008 counting only the distinct ones).

The product of its digits is 21952, while the sum is 34.

The square root of 71447272 is about 8452.6488156080. The cubic root of 71447272 is about 414.9494727278.

The spelling of 71447272 in words is "seventy-one million, four hundred forty-seven thousand, two hundred seventy-two".