71221228 has 24 divisors (see below), whose sum is σ = 142121952. Its totient is φ = 30937344.

The previous prime is 71221217. The next prime is 71221259. The reversal of 71221228 is 82212217.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39400 + ... + 41167.

It is an arithmetic number, because the mean of its divisors is an integer number (5921748).

Almost surely, 2^71221228 is an apocalyptic number.

It is an amenable number.

71221228 is a deficient number, since it is larger than the sum of its proper divisors (70900724).

71221228 is a wasteful number, since it uses less digits than its factorization.

71221228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80601 (or 80599 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 71221228 is about 8439.2670297840. The cubic root of 71221228 is about 414.5114064076.

The spelling of 71221228 in words is "seventy-one million, two hundred twenty-one thousand, two hundred twenty-eight".