71288839980 has 144 divisors (see below), whose sum is σ = 218650199040. Its totient is φ = 18799249536.

The previous prime is 71288839943. The next prime is 71288839981. The reversal of 71288839980 is 8993888217.

71288839980 is a `hidden beast` number, since 71 + 28 + 88 + 399 + 80 = 666.

It is not an unprimeable number, because it can be changed into a prime (71288839981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15552769 + ... + 15557351.

It is an arithmetic number, because the mean of its divisors is an integer number (1518404160).

Almost surely, 2^71288839980 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 71288839980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109325099520).

71288839980 is an abundant number, since it is smaller than the sum of its proper divisors (147361359060).

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

71288839980 is a wasteful number, since it uses less digits than its factorization.

71288839980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540 (or 5535 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 63.

The spelling of 71288839980 in words is "seventy-one billion, two hundred eighty-eight million, eight hundred thirty-nine thousand, nine hundred eighty".