71222280 has 32 divisors (see below), whose sum is σ = 213667200. Its totient is φ = 18992576.

The previous prime is 71222269. The next prime is 71222309. The reversal of 71222280 is 8222217.

It is a happy number.

It is a super-2 number, since 2×71222280² = 10145226336796800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71222280.

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, 296640 + ... + 296879.

It is an arithmetic number, because the mean of its divisors is an integer number (6677100).

Almost surely, 2^71222280 is an apocalyptic number.

It is an amenable number.

71222280 is an abundant number, since it is smaller than the sum of its proper divisors (142444920).

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

71222280 is a wasteful number, since it uses less digits than its factorization.

71222280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593533 (or 593529 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 71222280 is about 8439.3293572416. The cubic root of 71222280 is about 414.5134472965.

Adding to 71222280 its reverse (8222217), we get a palindrome (79444497).

The spelling of 71222280 in words is "seventy-one million, two hundred twenty-two thousand, two hundred eighty".