71820784036 has 27 divisors (see below), whose sum is σ = 128462506347. Its totient is φ = 35134013400.

The previous prime is 71820784031. The next prime is 71820784103. The reversal of 71820784036 is 63048702817.

The square root of 71820784036 is 267994.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71820784031) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25190011 + ... + 25192861.

Almost surely, 2^71820784036 is an apocalyptic number.

71820784036 is the 267994-th square number.

It is an amenable number.

71820784036 is a deficient number, since it is larger than the sum of its proper divisors (56641722311).

71820784036 is an frugal number, since it uses more digits than its factorization.

71820784036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800 (or 2900 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 71820784036 in words is "seventy-one billion, eight hundred twenty million, seven hundred eighty-four thousand, thirty-six".