71253430872 has 64 divisors (see below), whose sum is σ = 192449318880. Its totient is φ = 21854057472.

The previous prime is 71253430867. The next prime is 71253430933. The reversal of 71253430872 is 27803435217.

It is a happy number.

It is a super-2 number, since 2×71253430872² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267163 + ... + 462474.

Almost surely, 2^71253430872 is an apocalyptic number.

It is an amenable number.

71253430872 is an abundant number, since it is smaller than the sum of its proper divisors (121195888008).

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

71253430872 is a wasteful number, since it uses less digits than its factorization.

71253430872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729972 (or 729968 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 71253430872 in words is "seventy-one billion, two hundred fifty-three million, four hundred thirty thousand, eight hundred seventy-two".