71391132 has 60 divisors (see below), whose sum is σ = 196470120. Its totient is φ = 22542624.

The previous prime is 71391119. The next prime is 71391157. The reversal of 71391132 is 23119317.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 71391096 and 71391105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 358 + ... + 11954.

It is an arithmetic number, because the mean of its divisors is an integer number (3274502).

Almost surely, 2^71391132 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 71391132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98235060).

71391132 is an abundant number, since it is smaller than the sum of its proper divisors (125078988).

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

71391132 is a wasteful number, since it uses less digits than its factorization.

71391132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11632 (or 11621 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 71391132 is about 8449.3273105023. The cubic root of 71391132 is about 414.8407614742.

The spelling of 71391132 in words is "seventy-one million, three hundred ninety-one thousand, one hundred thirty-two".