81324198240 has 96 divisors (see below), whose sum is σ = 269653950720. Its totient is φ = 20545058304.

The previous prime is 81324198229. The next prime is 81324198247. The reversal of 81324198240 is 4289142318.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×81324198240² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81324198192 and 81324198201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81324198247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4449444 + ... + 4467683.

It is an arithmetic number, because the mean of its divisors is an integer number (2808895320).

Almost surely, 2^81324198240 is an apocalyptic number.

81324198240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81324198240 is an abundant number, since it is smaller than the sum of its proper divisors (188329752480).

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

81324198240 is a wasteful number, since it uses less digits than its factorization.

81324198240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8917164 (or 8917156 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 81324198240 in words is "eighty-one billion, three hundred twenty-four million, one hundred ninety-eight thousand, two hundred forty".