71187009020 has 24 divisors (see below), whose sum is σ = 151385035200. Its totient is φ = 28114362432.

The previous prime is 71187009017. The next prime is 71187009031. The reversal of 71187009020 is 2090078117.

It is a super-2 number, since 2×71187009020² (a number of 23 digits) contains 22 as substring.

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, 22525955 + ... + 22529114.

It is an arithmetic number, because the mean of its divisors is an integer number (6307709800).

Almost surely, 2^71187009020 is an apocalyptic number.

It is an amenable number.

71187009020 is an abundant number, since it is smaller than the sum of its proper divisors (80198026180).

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

71187009020 is a wasteful number, since it uses less digits than its factorization.

71187009020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45055157 (or 45055155 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The spelling of 71187009020 in words is "seventy-one billion, one hundred eighty-seven million, nine thousand, twenty".