81079884340 has 192 divisors, whose sum is σ = 216977080320. Its totient is φ = 24757332480.

The previous prime is 81079884313. The next prime is 81079884341. The reversal of 81079884340 is 4348897018.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81079884341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20252779 + ... + 20256781.

It is an arithmetic number, because the mean of its divisors is an integer number (1130088960).

Almost surely, 2^81079884340 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 81079884340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108488540160).

81079884340 is an abundant number, since it is smaller than the sum of its proper divisors (135897195980).

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

81079884340 is a wasteful number, since it uses less digits than its factorization.

81079884340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422 (or 4420 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 81079884340 in words is "eighty-one billion, seventy-nine million, eight hundred eighty-four thousand, three hundred forty".