71183442420 has 36 divisors (see below), whose sum is σ = 215923109220. Its totient is φ = 18982251264.

The previous prime is 71183442409. The next prime is 71183442479. The reversal of 71183442420 is 2424438117.

71183442420 is a `hidden beast` number, since 71 + 1 + 8 + 344 + 242 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 38562747876 + 32620694544 = 196374^2 + 180612^2 .

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

It is a super-2 number, since 2×71183442420² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197731605 + ... + 197731964.

It is an arithmetic number, because the mean of its divisors is an integer number (5997864145).

Almost surely, 2^71183442420 is an apocalyptic number.

It is an amenable number.

71183442420 is an abundant number, since it is smaller than the sum of its proper divisors (144739666800).

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

71183442420 is a wasteful number, since it uses less digits than its factorization.

71183442420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395463584 (or 395463579 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 71183442420 in words is "seventy-one billion, one hundred eighty-three million, four hundred forty-two thousand, four hundred twenty".