71408220 has 96 divisors (see below), whose sum is σ = 218115072. Its totient is φ = 17349888.

The previous prime is 71408219. The next prime is 71408243. The reversal of 71408220 is 2280417.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64189 + ... + 65291.

It is an arithmetic number, because the mean of its divisors is an integer number (2272032).

Almost surely, 2^71408220 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 71408220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109057536).

71408220 is an abundant number, since it is smaller than the sum of its proper divisors (146706852).

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

71408220 is a wasteful number, since it uses less digits than its factorization.

71408220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1209 counting only the distinct ones).

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

The square root of 71408220 is about 8450.3384547603. The cubic root of 71408220 is about 414.8738572441.

Adding to 71408220 its reverse (2280417), we get a palindrome (73688637).

The spelling of 71408220 in words is "seventy-one million, four hundred eight thousand, two hundred twenty".