71722816782 has 16 divisors (see below), whose sum is σ = 146152155600. Its totient is φ = 23456518592.

The previous prime is 71722816777. The next prime is 71722816787. The reversal of 71722816782 is 28761822717.

It is an interprime number because it is at equal distance from previous prime (71722816777) and next prime (71722816787).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71722816787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112771407 + ... + 112772042.

It is an arithmetic number, because the mean of its divisors is an integer number (9134509725).

Almost surely, 2^71722816782 is an apocalyptic number.

71722816782 is an abundant number, since it is smaller than the sum of its proper divisors (74429338818).

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

71722816782 is a wasteful number, since it uses less digits than its factorization.

71722816782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225543507.

The product of its digits is 1053696, while the sum is 51.

The spelling of 71722816782 in words is "seventy-one billion, seven hundred twenty-two million, eight hundred sixteen thousand, seven hundred eighty-two".