81709462452 has 96 divisors (see below), whose sum is σ = 202094548992. Its totient is φ = 25642970496.

The previous prime is 81709462423. The next prime is 81709462453. The reversal of 81709462452 is 25426490718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81709462453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4627713 + ... + 4645335.

It is an arithmetic number, because the mean of its divisors is an integer number (2105151552).

Almost surely, 2^81709462452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81709462452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101047274496).

81709462452 is an abundant number, since it is smaller than the sum of its proper divisors (120385086540).

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

81709462452 is a wasteful number, since it uses less digits than its factorization.

81709462452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17917 (or 17915 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 81709462452 in words is "eighty-one billion, seven hundred nine million, four hundred sixty-two thousand, four hundred fifty-two".