71528171904 has 512 divisors, whose sum is σ = 251343667200. Its totient is φ = 19595520000.

The previous prime is 71528171903. The next prime is 71528171909. The reversal of 71528171904 is 40917182517.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71528171904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71528171903) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95243529 + ... + 95244279.

It is an arithmetic number, because the mean of its divisors is an integer number (490905600).

Almost surely, 2^71528171904 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 71528171904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125671833600).

71528171904 is an abundant number, since it is smaller than the sum of its proper divisors (179815495296).

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

71528171904 is a wasteful number, since it uses less digits than its factorization.

71528171904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 71528171904 in words is "seventy-one billion, five hundred twenty-eight million, one hundred seventy-one thousand, nine hundred four".