71228144 has 40 divisors (see below), whose sum is σ = 150688272. Its totient is φ = 32417280.

The previous prime is 71228141. The next prime is 71228159. The reversal of 71228144 is 44182217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71228141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12839 + ... + 17529.

Almost surely, 2^71228144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71228144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75344136).

71228144 is an abundant number, since it is smaller than the sum of its proper divisors (79460128).

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

71228144 is a wasteful number, since it uses less digits than its factorization.

71228144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785 (or 4779 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 71228144 is about 8439.6767710618. The cubic root of 71228144 is about 414.5248231382.

The spelling of 71228144 in words is "seventy-one million, two hundred twenty-eight thousand, one hundred forty-four".