71139420 has 288 divisors, whose sum is σ = 259983360. Its totient is φ = 15552000.

The previous prime is 71139403. The next prime is 71139443. The reversal of 71139420 is 2493117.

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 95 ways as a sum of consecutive naturals, for example, 1166190 + ... + 1166250.

It is an arithmetic number, because the mean of its divisors is an integer number (902720).

Almost surely, 2^71139420 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 71139420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129991680).

71139420 is an abundant number, since it is smaller than the sum of its proper divisors (188843940).

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

71139420 is a wasteful number, since it uses less digits than its factorization.

71139420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 71139420 is about 8434.4187707275. The cubic root of 71139420 is about 414.3526366042.

The spelling of 71139420 in words is "seventy-one million, one hundred thirty-nine thousand, four hundred twenty".