71328420 has 36 divisors (see below), whose sum is σ = 216363420. Its totient is φ = 19020864.

The previous prime is 71328353. The next prime is 71328437. The reversal of 71328420 is 2482317.

It can be written as a sum of positive squares in 2 ways, for example, as 16064064 + 55264356 = 4008^2 + 7434^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197955 + ... + 198314.

It is an arithmetic number, because the mean of its divisors is an integer number (6010095).

Almost surely, 2^71328420 is an apocalyptic number.

It is an amenable number.

71328420 is an abundant number, since it is smaller than the sum of its proper divisors (145035000).

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

71328420 is a wasteful number, since it uses less digits than its factorization.

71328420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396284 (or 396279 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 71328420 is about 8445.6154305059. The cubic root of 71328420 is about 414.7192565832.

The spelling of 71328420 in words is "seventy-one million, three hundred twenty-eight thousand, four hundred twenty".