71330420 has 48 divisors (see below), whose sum is σ = 172488960. Its totient is φ = 24271104.

The previous prime is 71330407. The next prime is 71330423. The reversal of 71330420 is 2403317.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 71330392 and 71330401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71330423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17321 + ... + 21039.

It is an arithmetic number, because the mean of its divisors is an integer number (3593520).

Almost surely, 2^71330420 is an apocalyptic number.

71330420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71330420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86244480).

71330420 is an abundant number, since it is smaller than the sum of its proper divisors (101158540).

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

71330420 is a wasteful number, since it uses less digits than its factorization.

71330420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872 (or 3870 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 71330420 is about 8445.7338343095. The cubic root of 71330420 is about 414.7231326949.

Adding to 71330420 its reverse (2403317), we get a palindrome (73733737).

The spelling of 71330420 in words is "seventy-one million, three hundred thirty thousand, four hundred twenty".