71736728 has 64 divisors (see below), whose sum is σ = 162539520. Its totient is φ = 29060640.

The previous prime is 71736727. The next prime is 71736733. The reversal of 71736728 is 82763717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71736727) 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, 1668275 + ... + 1668317.

It is an arithmetic number, because the mean of its divisors is an integer number (2539680).

Almost surely, 2^71736728 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 71736728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81269760).

71736728 is an abundant number, since it is smaller than the sum of its proper divisors (90802792).

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

71736728 is an equidigital number, since it uses as much as digits as its factorization.

71736728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 83 counting only the distinct ones).

The product of its digits is 98784, while the sum is 41.

The square root of 71736728 is about 8469.7537154276. The cubic root of 71736728 is about 415.5090825134.

The spelling of 71736728 in words is "seventy-one million, seven hundred thirty-six thousand, seven hundred twenty-eight".