71530444728 has 144 divisors (see below), whose sum is σ = 202923040320. Its totient is φ = 22761159168.

The previous prime is 71530444697. The next prime is 71530444747. The reversal of 71530444728 is 82744403517.

71530444728 is a `hidden beast` number, since 7 + 1 + 530 + 4 + 44 + 72 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22584601 + ... + 22587767.

It is an arithmetic number, because the mean of its divisors is an integer number (1409187780).

Almost surely, 2^71530444728 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 71530444728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101461520160).

71530444728 is an abundant number, since it is smaller than the sum of its proper divisors (131392595592).

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

71530444728 is a wasteful number, since it uses less digits than its factorization.

71530444728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818 (or 3788 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 45.

The spelling of 71530444728 in words is "seventy-one billion, five hundred thirty million, four hundred forty-four thousand, seven hundred twenty-eight".