71139320 has 64 divisors (see below), whose sum is σ = 189259200. Its totient is φ = 23546880.

The previous prime is 71139311. The next prime is 71139323. The reversal of 71139320 is 2393117.

It is a self number, because there is not a number n which added to its sum of digits gives 71139320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71139323) 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, 3740 + ... + 12500.

It is an arithmetic number, because the mean of its divisors is an integer number (2957175).

Almost surely, 2^71139320 is an apocalyptic number.

71139320 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 71139320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94629600).

71139320 is an abundant number, since it is smaller than the sum of its proper divisors (118119880).

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

71139320 is a wasteful number, since it uses less digits than its factorization.

71139320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808 (or 8804 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 71139320 is about 8434.4128426346. The cubic root of 71139320 is about 414.3524424536.

The spelling of 71139320 in words is "seventy-one million, one hundred thirty-nine thousand, three hundred twenty".