71891712 has 90 divisors (see below), whose sum is σ = 214429908. Its totient is φ = 23956992.

The previous prime is 71891711. The next prime is 71891719. The reversal of 71891712 is 21719817.

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

It is not an unprimeable number, because it can be changed into a prime (71891711) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19003 + ... + 22469.

Almost surely, 2^71891712 is an apocalyptic number.

71891712 is a gapful number since it is divisible by the number (72) 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 71891712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107214954).

71891712 is an abundant number, since it is smaller than the sum of its proper divisors (142538196).

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

71891712 is an equidigital number, since it uses as much as digits as its factorization.

71891712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495 (or 3472 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 71891712 is about 8478.8980416089. The cubic root of 71891712 is about 415.8080968920.

The spelling of 71891712 in words is "seventy-one million, eight hundred ninety-one thousand, seven hundred twelve".