81923341528 has 32 divisors (see below), whose sum is σ = 175992256800. Its totient is φ = 35021555712.

The previous prime is 81923341483. The next prime is 81923341529. The reversal of 81923341528 is 82514332918.

It is a super-2 number, since 2×81923341528² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81923341529) 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 7 ways as a sum of consecutive naturals, for example, 1820233 + ... + 1864696.

It is an arithmetic number, because the mean of its divisors is an integer number (5499758025).

Almost surely, 2^81923341528 is an apocalyptic number.

It is an amenable number.

81923341528 is an abundant number, since it is smaller than the sum of its proper divisors (94068915272).

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

81923341528 is a wasteful number, since it uses less digits than its factorization.

81923341528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685339 (or 3685335 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The spelling of 81923341528 in words is "eighty-one billion, nine hundred twenty-three million, three hundred forty-one thousand, five hundred twenty-eight".