81344390750 has 32 divisors (see below), whose sum is σ = 174030517440. Its totient is φ = 27889504800.

The previous prime is 81344390719. The next prime is 81344390821. The reversal of 81344390750 is 5709344318.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23239505 + ... + 23243004.

It is an arithmetic number, because the mean of its divisors is an integer number (5438453670).

Almost surely, 2^81344390750 is an apocalyptic number.

81344390750 is an abundant number, since it is smaller than the sum of its proper divisors (92686126690).

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

81344390750 is a wasteful number, since it uses less digits than its factorization.

81344390750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46482533 (or 46482523 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 81344390750 in words is "eighty-one billion, three hundred forty-four million, three hundred ninety thousand, seven hundred fifty".