71220 has 24 divisors (see below), whose sum is σ = 199584. Its totient is φ = 18976.
The previous prime is 71209. The next prime is 71233. The reversal of 71220 is 2217.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a junction number, because it is equal to n+sod(n) for n = 71196 and 71205.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 653.
It is an arithmetic number, because the mean of its divisors is an integer number (8316).
271220 is an apocalyptic number.
It is an amenable number.
71220 is an abundant number, since it is smaller than the sum of its proper divisors (128364).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99792).
71220 is a wasteful number, since it uses less digits than its factorization.
71220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1199 (or 1197 counting only the distinct ones).
The product of its (nonzero) digits is 28, while the sum is 12.
The square root of 71220 is about 266.8707552356. The cubic root of 71220 is about 41.4509024052.
Adding to 71220 its reverse (2217), we get a palindrome (73437).
The spelling of 71220 in words is "seventy-one thousand, two hundred twenty", and thus it is an iban number.
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