71121307728 has 40 divisors (see below), whose sum is σ = 183792924000. Its totient is φ = 23698989184.

The previous prime is 71121307709. The next prime is 71121307739. The reversal of 71121307728 is 82770312117.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111003 + ... + 393146.

It is an arithmetic number, because the mean of its divisors is an integer number (4594823100).

Almost surely, 2^71121307728 is an apocalyptic number.

It is an amenable number.

71121307728 is an abundant number, since it is smaller than the sum of its proper divisors (112671616272).

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

71121307728 is a wasteful number, since it uses less digits than its factorization.

71121307728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507099 (or 507093 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 39.

The spelling of 71121307728 in words is "seventy-one billion, one hundred twenty-one million, three hundred seven thousand, seven hundred twenty-eight".