81723265392 has 40 divisors (see below), whose sum is σ = 211424047360. Its totient is φ = 27201654720.

The previous prime is 81723265387. The next prime is 81723265409. The reversal of 81723265392 is 29356232718.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 1198792 + ... + 1265127.

It is an arithmetic number, because the mean of its divisors is an integer number (5285601184).

Almost surely, 2^81723265392 is an apocalyptic number.

It is an amenable number.

81723265392 is an abundant number, since it is smaller than the sum of its proper divisors (129700781968).

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

81723265392 is a wasteful number, since it uses less digits than its factorization.

81723265392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464621 (or 2464615 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

It can be divided in two parts, 8172326 and 5392, that added together give a palindrome (8177718).

The spelling of 81723265392 in words is "eighty-one billion, seven hundred twenty-three million, two hundred sixty-five thousand, three hundred ninety-two".