71081136 has 120 divisors (see below), whose sum is σ = 229342464. Its totient is φ = 20131200.

The previous prime is 71081123. The next prime is 71081137. The reversal of 71081136 is 63118017.

It is not an unprimeable number, because it can be changed into a prime (71081137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151975 + ... + 152441.

Almost surely, 2^71081136 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 71081136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114671232).

71081136 is an abundant number, since it is smaller than the sum of its proper divisors (158261328).

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

71081136 is a wasteful number, since it uses less digits than its factorization.

71081136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 71081136 is about 8430.9629343273. The cubic root of 71081136 is about 414.2394470045.

It can be divided in two parts, 71081 and 136, that added together give a palindrome (71217).

The spelling of 71081136 in words is "seventy-one million, eighty-one thousand, one hundred thirty-six".