71308991088 has 80 divisors (see below), whose sum is σ = 204959619840. Its totient is φ = 23737565376.

The previous prime is 71308991081. The next prime is 71308991101. The reversal of 71308991088 is 88019980317.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71308991081) 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, 209895 + ... + 432057.

It is an arithmetic number, because the mean of its divisors is an integer number (2561995248).

Almost surely, 2^71308991088 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 71308991088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102479809920).

71308991088 is an abundant number, since it is smaller than the sum of its proper divisors (133650628752).

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

71308991088 is a wasteful number, since it uses less digits than its factorization.

71308991088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222923 (or 222911 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 71308991088 in words is "seventy-one billion, three hundred eight million, nine hundred ninety-one thousand, eighty-eight".